---
product_id: 634100592
title: "GP4000 4000A Peak Car Battery Jump Starter, Portable Battery Booster for Up to All Gas or 10L Diesel Engine, SuperSafe 12V Lithium Jump Box Power Pack with Jumper Cable,Red"
brand: "gooloo"
price: "6697979₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Gooloo"
url: https://www.desertcart.vn/products/634100592-gp4000-4000a-peak-car-battery-jump-starter-portable-battery-booster
store_origin: VN
region: Vietnam
---

# 4000A peak jump power 24,000mAh lithium-polymer capacity Dual USB + USB-C fast charging GP4000 4000A Peak Car Battery Jump Starter, Portable Battery Booster for Up to All Gas or 10L Diesel Engine, SuperSafe 12V Lithium Jump Box Power Pack with Jumper Cable,Red

**Brand:** gooloo
**Price:** 6697979₫
**Availability:** ✅ In Stock

## Summary

> 🚗⚡ Power up your ride & never get stranded again!

## Quick Answers

- **What is this?** GP4000 4000A Peak Car Battery Jump Starter, Portable Battery Booster for Up to All Gas or 10L Diesel Engine, SuperSafe 12V Lithium Jump Box Power Pack with Jumper Cable,Red by gooloo
- **How much does it cost?** 6697979₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/634100592-gp4000-4000a-peak-car-battery-jump-starter-portable-battery-booster)

## Best For

- gooloo enthusiasts

## Why This Product

- Trusted gooloo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart & Safe Tech:** 10-layer protection system ensures spark-free, foolproof operation even in extreme temperatures (-4°F to 140°F)
- • **All-Day Energy Bank:** Massive 24,000mAh lithium-polymer battery supports 60+ jump starts per full charge
- • **Instant Power Surge:** 4000 amps peak current to jump-start gas & diesel engines up to 10L in seconds
- • **Built for the Unexpected:** Rugged design with metal clamps, drop-resistant casing, and built-in flashlight for night emergencies
- • **Multi-Device Charging Hub:** Dual USB ports plus USB-C (5V/3A) keep your gadgets and jump starter fully powered

## Overview

The GOOLOO GP4000 is a compact yet powerhouse 12V lithium-polymer jump starter delivering 4000 amps peak current, capable of jump-starting all gasoline and diesel engines up to 10L. With a robust 24,000mAh battery, it offers over 60 jump starts per charge and doubles as a versatile power bank featuring dual USB and USB-C fast charging ports. Engineered for safety and durability, it includes smart metal clamps, 10 built-in protections, and a rugged design with a flashlight, ensuring reliable performance in extreme weather conditions. Perfect for professionals and adventurers alike, it fits easily in your glove box or bag, providing peace of mind wherever the road takes you.

## Description

Buy GOOLOO GP4000 4000A Peak Car Battery Jump Starter, Portable Battery Booster for Up to All Gas or 10L Diesel Engine, SuperSafe 12V Lithium Jump Box Power Pack with Jumper Cable,Red: Jump Starters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: WOW! Such power from such a little package. - I had battery booster that suddenly quit working because it couldn't be recharged. That item now costs $300 so I looked into others and found that this GOOLOO booster would probably suit my needs for less than a third of the cost. When I received the product, it was so small I was thinking that I had fallen for some scam advertising or a cheap product that wouldn't work more than once or twice. Boy, was I surprised to find out I was entirely wrong. Unfortunately I've had to use it several times already since I purchased it. Nearly every time it fired up the car better than the fairly new battery in the car does when it is fully charged. I've used it several times in a row without a recharge and each time it provides all the power needed. That's proof that it doesn't need to be recharged after each use. The only time it failed to get me started was when my battery had been discharged to 0% - totally dead. But that's to be expected and the instruction are clear that it is not intended to do this and will not start a car with a fully discharged battery. The booster comes in a very nice and attractive carrying case which would probably fit in most cars' glove box. What I don't like about the unit is that the cables are separate from the booster itself and must be plugged into the unit before each use. At night this can be very difficult to find the receptacle and align the plug. The instructions prescribe a certain sequence for connection too which I do not recall at this time. You must either plug the jumper wires into the unit first or connect them to the car first before turning the unit on. I can never remember the sequence and it is not printed on the unit itself as a reminder. I haven't noticed any difference in the way it works between the two methods so lately I have been plugging the cables in first and then attaching the positive cable to the battery followed by the negative. When I do this the unit powers on by itself and is ready to go. Another complaint is that it is difficult to repack the unit, battery cables and accessory into the nice little carrying case so that you can zip it up closed. There are two or three compartments in the bag for stowing the items. It would be much easier if there were only two (one for the unit and cables; the other for accessories) or none. Recharging is done via USB so you can readily plug it into your car's USB port or use an adapter to use the car's power outlet. Then as you drive along it will recharge the unit. That's convenient because then you will always have the unit fully charged and you won't be forgetting at home or office because you left it there to recharge. So, there are some things that could be better but for a savings of more than $200 it still does what it is meant to do - jump start your car - as well as any fancy high-priced unit on the market. In fact, the battery went dead while my car was in the garage for an inspection sticker. The owner used my unit to start my car because his was not fully charge and was too inconvenient to get to. I recommend this product base on personal use and great results.
Review: Reaaly works!! BELEIVE the mfgr'r's claims!! - This is a long, involved Review. So... be patient. I bought this Gooloo unit exactly 30 days ago. Today provided my first opportunity to test it out. Background: I'm a 74 yr old Disabled/Retired Senior; confined to a wheelchair. I live off of my monthly SS check; so, limited income/essentially no savings. I live alone, ~ 60 mi. S. of Abq., NM; and make one errand run into Abq., each month - ~ 140 mi. round trip, with the around-town errands included. I put less than 1500 miles on my car, per year. I inherited the car when my mother died in 2010. The car is a 2002 Pontiac Bonneville; so, closing up on 21/22 yrs old. The stock battery lasted 15 yrs, but I've had ongoing dead-battery issues, since. I've put in four NAPA-grade batteries in the last 7 yrs, or so; two, new (at ~ $200 a pop), and two under limited warranty replacement (~ $80 a pop). The battery lives under the rear seat, and, what with the nature of my handicaps... it's pretty much a quite considerable pain for me to replace one. Over the last 7 yrs, the car has suffered from some sort of unidentified, intermittent drain on the bat, that deads it out maybe six to eight times a year. I suspect something like a malfunctioning trunk light switch, but have never been able to nail down the exact issue (I rmv'd the trunk lamp/bulb, but still have the issue; so... go figure). Anymore, I ck the battery once or twice a week; but still run into the dead bat issue, all too often. Unfortunately, before I discover it so... the battery often sits dead for several days or more; sulfate'ing away, all the while; i.e., getting deader & deader each day, before I actually discover that it IS dead. If dead (sulfate'd) for too long (a week or two?)... the bat is unrecoverable; and then requires replacement. I have multiple, high quality bat chrgrs, but, if the bat's been sulfate'ing, it can take up to several hours, or more, to get it to accept enough charge to (barely) start the car. I have no garage, so the car lives on the street, out front; and it is not practical to use a Battery Tender/trickle charger on it (pwr cord/public sidewalk/safety issues). When I think the bat's getting marginal, I start the car, and run it for 15 minutes, to top off the bat. Background, complete. In reading the desertcart reviews (and some from other sites) I noticed a couple of reviewers lambasting the Gooloo unit(s) for having a small, actual AH (Amp Hour) rating. I had already been wondering how SUCH a small unit... could start a car; much less, the over 60 times per charge claimed for this unit (and, that, at ONLY 50% or greater retained charge [not supposed to use it to jump-start, at all, below 50% charge]). In the specs, this unit is rated at ~ 98 WH (Watt Hours). No actual AH (Amp Hour) Rating is provided. I've been in electronics all my career, so have the wherewithal to apply the appropriate math to the issue. 98 WH IS a tad under 8 AH; just as the negative reviewer(s) were/are claiming. It appears, however, that they were wanting to use the units to run some sort of meteorological/ecological instrumentation setups (?); and, sure enough, only 8 AH is hardly going to get that sort of job done! So... how does this all compute? A little more background is needed, here. Mfgr's commonly use a procedure called 'binning'; essentially, dividing the production line output into, essentially, Good, Better, Best ratings. Three-level binnings are common, though you can obviously go further; until reaching the level of full rejection/unacceptable performance/failure. I literally have dozens of Makita brand, battery operated tools; and have something like 37 batteries for same, in two sizes (AH Ratings). Most are fairly old, the oldest being in excess of 15 yrs. I used to pull all the bats every six or eight months, and run them all through my chargers. However, I found, over the years, that they (unless the bat/unit had been recently/heavily drained) typically achieved full charge in under five minutes; occasionally, as long as 30 mins. Commonly, though, most of my Makita bats reach Full in under 30 seconds!! (basically, the ones that have been sitting in unused tools - as long as a year - or more). Anymore, I run the Kita bats through the chargers only on an annual (or, longer) basis. And... with the same consistently impressive results! They REALLY hold a charge well!! This is a good example of First Binning lithium-ion cell selection (a 'battery', by definition, being comprised of multiple 'cells'); i.e., the batteries only contain the highest quality cells. At the other end of the spectrum, are the bats for my Ryobi brand tools (Home Depot). The Ryobi tools are incredibly cheap, and a 'relatively' good value; even if you just use them up to destruction, and then simply buy new replacements; as I've read some construction workers claim to regularly do. Unfortunately, the Ryobi batteries are the complete opposite in value. I quit buying them after eight batteries (I've had to toss out two, and have two more that are minimally functional/very difficult to take on a charge). Unlike the Makita bats, the Ryobi bats are only avlble from Home Depot (no where else - like at desertcart, for instance). Further, they charge $80 per bat, and are never discounted. Of my six remaining Ryobi bats, ALL fail to hold a charge for more than a month or so; and several, won't even hold a charge for a week or more. Further, unlike the Makita bats, they also don't seem to perform anywhere near their AH Ratings (also, compared to my Milwaukee tool bats). Though, I'm simply too lazy to have actually run AH Rating analysis on them (fixed resistor load, over measured time, to a set level of discharge). This is an obvious example of Third Binning (or, worse) cell selection. I might also note that this is old history. I recently noticed that Ryobi has newer lines of their bats, that appear to (possibly) be of better quality/value. But, having been soooo burned, in the past... I've not invested/investigated, further. Nor, plan to. When Milwaukee started up in competition to Makita's battery line(s) of tools, quite some years, back... I encountered multiple quality issues with their batteries, too. I had to toss several, as completely unusable/failed. That's when I discovered that procuring individual replacement cells, with which to change out the dead cells/repair the battery, was actually more expensive than simply buying a new battery!! I'd guess, when they were starting out, that Milwaukee was using Second or Third Binning cells. But, over time... as I replaced the trashed bats with newer ones, I think they had realized their error, and had moved up to using First Binning cells; as, from that point onward, and, to this day, I've had results with their bats, similar to the excellent experience(s) I've always had with my Makita bats. So... a large, 8-cylinder ICE-type engine's starter, as I recall, typically draws several hundred amps off the battery, during starting. Just for grins, and ease at math being done in my head, I use(d) 333 amps as an average draw. Obviously, with smaller engines/starters, the draw will be considerably less (or, somewhat more, in the case of a BIG truck's diesel engine, say). My car's engine is a 6 cylinder; so, maybe around 200 Amps, max? Assuming an engine is in good tune/shape, a typical start takes 3 seconds, or less. Say, five or six, if the engine is 'less than optimal', for what ever (hopefully, temporary) reason. Soo... 333 Amps, for three seconds, computes to roughly 0.1 AH draw (load). Thus, at the above loading level, dividing 8 AH by that 0.1... will yield '80 starts'. But, limiting to 50% Gooloo battery charge, and, just for grins, assuming linear performance from said battery, say... 40 starts. Then... figure that, most often, many starts take LESS than one to two actual seconds (time it off in your mind, then compare to your usual engine starting time duration experience). So... boost that '40 starts'... up to 60 starts. Which, in actuality, isn't at all that unreasonable a claim. That all assumes the Gooloo battery IS capable of a very high, short-term current (Ampere) output. How to assure that? First off, use ONLY the highest binning cells for the batteries. Likely, they even use 'special' cells; designed and selected for extra-high amperage output. Then, instead of using only one or two spot-welded straps to interconnect each cell to the next one, let's assume double, or even triple the number of straps. And/or, to further augment high current capability, assume usage of much heavier (lower current resistance) straps. Then... lets maybe assume using the types of cell construction developed for the electric car industry (obviously, high-quality, high-current-drain-capability cells needed, there!). Or, equivalent. And, thennnn... lets include enough cells in the battery (in series, that is - the voltages adding serially) to have a higher output voltage (often analogized/compared/equivalent to water pressure, in a hose); so as to more easily drive/supply higher current (volume - i.e., G.'s per minute of water) from the battery. I measured the output of the Gooloo unit I have; and it measures over 16 Volts (unloaded). At 3.7 Volts, nominal, per lithium cell (up to 4.2 Volts, fully charged), often mfgr's will claim 12 Volts, off off 3 cells in series. Better to go with four cells - 14.8 Volts, nominal. So, at 16+ Volts measured... maybe Gooloo uses five cells in series; or, perhaps, one of the alternate lithium chemistries (such as lithium-phosphate) - resulting in slightly different voltages per cell, and a slightly different total, for the overall composite battery. Add all this together... and I can understand how such a small battery (8 AH) CAN easily start a car. And, often... say, 50 or 60 actual jump-starts per charge cycle. Now... how did all this work out in my ACTUAL experience, today? To start, my battery was 'dead as a door nail' - i.e., deader than dead. Nada. Wouldn't even allow unlocking the door(s) (or, gas cap cover/opening the trunk) from the remote fob. Arrgghh! So... a prime case with which to test the Gooloo. I didn't want to pull the rear seat, to gain direct access to the battery, so popped the hood, and connected the way I usually use one of my battery chargers to try to recover/charge the dead battery - connecting the Gooloo's Black lead/clamp to a bolt on the engine's alternator mounting assy, and flipping up the plastic 'safety cover' leading into the primary fuse box's incoming 'Plus' terminal (my car has a secondary fuse box, near the battery, under the rear seat. Go figure.), to connect the Gooloo's Red lead to. Since the bat was soooo dead... and as outlined in the Gooloo's Instructions... after obtaining the Green light on the jumper cable module as blinking... I pressed the little nearby 'Boost Button'... and got a solid Green. As soon as I had connected the Gooloo, and prior to pressing the little button, all my running lights and such, had lit up merrily bright. 'Encouraging!', I had thought. But, when I got in the car and hit the starter... all I got was a short 'blip' - no starter turn-over - and... all the lights went out. Grumble, grumble!! But.... I certainly wasn't ready to give up. Yet. I got back under the hood, and checked my connections. When I jiggled/ck'd the Black lead... I got sparks! Indicative of an inadequately secured connection. I made sure it was WELL clamped in place, this time, jimmying it about as bit, so the teeth of the clamp could pierce through any oxidation on the bolt-head I'd chosen. And... all the lights came back on - brightly! THIS time... when I hit the starter... the engine spun enthusiastically... and - 'Vroom'! - started right up! Happy camper, I!! :-) :-) So... I am VERY confident & happy, now, in/with my Gooloo unit. And, by my above suppositions and calculations... do not doubt the claimed '60 jump-starts' being advertised/claimed for this unit. I'm impressed with the Gooloo in ALL considerations (as so well detailed/outlined by the other reviewers). HIGHLY Recommended!! Addendum: It's about ten days later from the above, now. Once again... grumble, grumble... my car's bat is all sorts of dead. Only this time... the Gooloo couldn't start it - at all. I had noticed that desertcart had posted my Review as the 'Most Positive' review. I hope it stays that way, as I am still feeling very positive about the Gooloo unit; but... now having encountered some real world limitations to it's 'practical' usage - thought that they were worth being noted, here. I had also noticed that the 'Least Positive' review had complained that the Gooloo was unable to start his vehicle, when he had a very dead battery. Considering my success with doing just that (in the upper/first part of this review), I was a bit... puzzled/surprised. Well... no more. Apparently, earlier, I DID have a very dead battery; but... no where NEAR as truly double-dead-dead as with this 2nd attempted use of the Gooloo unit. As before, I had connected the Gooloo, engaged the 'Boost Button', and got (external) running lights; but lost all, when I (unsuccessfully) tried to start the vehicle. Just got nothing; no starter turnover, and 'lights out'. The Gooloo went from Boost Mode, back to a blinking green light on the jumper module. Tried it several times; same, each. Arrgghh! However... I did recall that the instructions advised letting the Gooloo be attached for a few minutes PRIOR to jump-starting; which I had been knowledgeably/purposely been avoiding doing, as I had been more interested in subjecting the Gooloo to worst case, 'street' conditions/usage. Well... things just got even worse for it, this time. Sooo... I decided to let the unit hang onto the car's bat, and transfer some charge into it; in hopes that that would enable the Gooloo to, a little bit later, jump start it. Fortunately, all this is/was going on at my residence, not 'out in the wild'; although that was exactly why I was trying this particular methodology out - like this, here & now. In watching the unit, I noticed the green light cycling - 6 seconds On, one sec Off, then, repeat; consistently. After having gotten bored watching that, I moved over into the shade of the building; from which vantage (out of the bright [hot!] sun at the front of the car), I was able to observe the rear running lights. Which were bright for four secs, dimming to being out completely, over the next 2 secs, remaining so for the 1 sec the jump cable module's SoC ('Solution-on-a-Chip' - the industry's nomenclature for a custom-designed, single-purpose IC chip) was using to Reset itself, each cycle, and then repeat - over & over. So I felt confident that the Gooloo WAS transferring charge into the vehicle's battery. (Which did, indeed, later prove to have been the case). After all was over, I plugged the Gooloo unit into a charger, via USB-C. Before, the unit was showing 2 solid bars (when I disconnected it); now, while initializing charging, it had 1 solid bar, and was blinking the second one (later, progressively, the 3rd and 4th ones) - thus, my conclusion that I HAD xfer'd OVER half the Gooloo's charge into my car's battery. BTW, despite being connected to a 50W charger/wall-wart, that I often use on my Samsung S23 Ultra cell phone, the Gooloo took 5 hours to reach Full charge; thus leading me to the conclusion that the unit's firmware does not honor/recognize Hi-Speed USB charger protocols (perhaps introduced AFTER the Gooloo's design phase had been locked in place?). But... after 15 minutes of charge xfer time had passed... the Gooloo still couldn't start the car. When I disconnected it, I noticed that the Gooloo bat's power indicator showed 2 bars (see above); indicating it HAD xfr'd some energy into the car's bat. A bit over half of the Gooloo's 8 AH capacity, as DID actually prove out. And... the instructions DO state NOT to try jump starting below 50% charge (which this unit WAS at, at that point). So... maybe... had I only xfer'd charge for, say... 5 minutes?... MAYBE... the Gooloo (being at over 50% charge, at this 'conjectural' point in time) WOULD have successfully jump-started my car. I'd like to think so; and, if similar circumstances present again, in future, will test out such. Back to today... I then set out my safety cones, ran out an extension cord, and hooked up my (larger) car bat chrgr. Which, like so many things, today, is waaaay over-software-engineered; meaning that all the supposed advantages to doing so, during the design phase... often result in annoying, real-world limitations, in day-to-day usage scenarios. Which, in this case... the charger wanting to see at least a FEW volts on the battery... often leading to hassles getting the durned thing to actually charge the battery at all - when encountering a very dead one! Fortunately, however... in THIS circumstance... it read out 4 Volts present in/on the car's battery; thus verifying the Gooloo's energy xfer. I let the AC charger do it's thing for about an hour... returned to find that car's bat at ~ 11 Volts, and maybe 35% charge, and, then, managed to successfully start there car. WHEW!! So, for 'normal' dead battery issues, and with an otherwise viable, healthy battery... I feel the Gooloo unit is STILL to be Highly Recommended. However... when encountering VERY dead/unhealthy-unhappy/compromised batteries (like mine was/is)... it would be wise to be aware of the above limitations. Best of luck to you all.

## Features

- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack jump starter is capable of quickly jump-starting a dead car battery. Even if the battery voltage is extremely low, simply pressing the "BOOST" button will forcefully restart the car. The GOOLOO car battery charger jump starter can effectively start all gasoline engines and diesel engines up to 10.0L within mere seconds. This versatile device is compatible with 12v vehicles, motorcycles, pickup trucks, RVs, tractors, trucks, cargo vans, ATVs, snowmobiles, yachts, and various other vehicles.
- Colossal Capacity Portable Charger - The GP4000 car battery charger jump starter boasts an immense capacity and offers dual USB charging output ports (one supporting fast charging) along with a USB Type-C charging port (5V/3A). This versatile power source enables you to charge other devices or recharge the jump starter itself. Its compact design ensures high portability, making it capable of efficiently charging various portable devices such as smartphones, tablets, cameras, GPS systems, and more.
- Emergency Life Saver - The GOOLOO GP4000 car jump starter provides quick vehicle jump-starting capabilities, ensuring that you're not stranded and exposed to potential dangers for an extended period of time. With a full charge, it can jump-start most vehicles over 60 times, offering reliable assistance in emergency situations.
- Safety & Quality Metal Clamps - The GOOLOO booster pack jump starter is equipped with 10 different types of built-in protection, alleviating concerns about misuse and sparks. Our primary objective was to ensure that users feel completely safe while using our product. The Smart Jumper Cables are designed with durable all-metal clamps to prevent damage that may occur from long-term usage.
- Rugged 12V Car Jump Starter - The sturdy construction of hardened plastic and rubber corners ensures that the jump starter can withstand drops without any issues. Additionally, it features a built-in flashlight to provide assistance during vehicle emergencies at night.
- Reliable in Extreme Cold Weather - The advanced smart chip used in the GP4000 jump pack ensures fast and dependable car startup even in extreme temperatures ranging from -4°F (-20°C) to 140°F (60°C).
- IN THE BOX - GOOLOO Heavy-Duty Portable Car Battery Jump Starter GP4000, Smart Jumper Cable, USB to Type-C Cable, Cigarette Lighter Socket Adapter, EVA Storage Case, 18 Months Warranty and Lifetime Tech Support. (Wall charger is not included)
- 【TIPS】 If the jump starter has been idle for an extended period, it is advisable to charge it every 2-3 months to maintain its optimal condition.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D2HH3BDN |
| Amperage | 4000 Amps |
| Battery Capacity | 24000 Milliamp Hours |
| Battery Cell Composition | Lithium Polymer |
| Battery Type | Lithium Polymer |
| Best Sellers Rank | #1,266 in Automotive ( See Top 100 in Automotive ) #30 in Jump Starters |
| Brand | GOOLOO |
| Brand Name | GOOLOO |
| Compatible with Vehicle Type | ATV, Bus, Lawn Mower, Motorcycle, Passenger Car, RV, Truck, UTV, Van |
| Customer Reviews | 4.6 out of 5 stars 8,422 Reviews |
| Included Components | GOOLOO Portable Car Jump Starter GP4000, Smart Jumper Cable, USB to Type-C Cable, EVA Storage Case, Cigarette Lighter Socket Adapter |
| Item Dimensions D x W x H | 3.92"D x 8.97"W x 1.49"H |
| Manufacturer | Shenzhen Carku Technology Co., Limited |
| Manufacturer Part Number | GP4000 |
| Manufacturer Warranty Description | 18-Month warranty |
| Peak Output Current | 4000 Amps |
| Product Dimensions | 3.92"D x 8.97"W x 1.49"H |
| Vehicle Service Type | ATV, Bus, Lawn Mower, Motorcycle, Passenger Car, RV, Truck, UTV, Van |
| Voltage | 12 Volts (DC) |

## Product Details

- **Battery Cell Composition:** Lithium Polymer
- **Brand:** GOOLOO
- **Product Dimensions:** 3.92"D x 8.97"W x 1.49"H
- **Vehicle Service Type:** ATV, Bus, Lawn Mower, Motorcycle, Passenger Car, RV, Truck, UTV, Van
- **Voltage:** 12 Volts (DC)

## Images

![GP4000 4000A Peak Car Battery Jump Starter, Portable Battery Booster for Up to All Gas or 10L Diesel Engine, SuperSafe 12V Lithium Jump Box Power Pack with Jumper Cable,Red - Image 1](https://m.media-amazon.com/images/I/61ENE9c2fhL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Can I take the GOOLOO GP4000 jumper pack on a plane?**
A: Yes, this jump starter is airline-safe. With a battery capacity under 100Wh, it complies with FAA/IATA regulations for carry-on devices.

**Q: Can I leave a jump starter plugged in all the time?**
A: No, you can't do that. Many people assume leaving the jump starter connected to the car after a successful engine start will quickly recharge it, but this is a common misconception. Doing so is not advisable and can lead to unintended consequences.

**Q: How long should it take to jump a car?**
A: Once the jumper cable is properly connected to the car battery, the GOOLOO GP4000 battery jumper starter will quickly start the vehicle within 3 seconds.

**Q: Can I jump out of the car on a rainy day?**
A: Don't worry too much. It's safe to jump-start in rain. Vehicle voltage is low, and light rain won't harm if you follow proper steps. Just keep the Jumper cables and product interfaces dry during the process.

**Q: Can this be used to charge a battery out of the car?**
A: Sorry, this portable jump starter can't charge the car battery directly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ WOW! Such power from such a little package.
*by Q***K on December 9, 2023*

I had battery booster that suddenly quit working because it couldn't be recharged. That item now costs $300 so I looked into others and found that this GOOLOO booster would probably suit my needs for less than a third of the cost. When I received the product, it was so small I was thinking that I had fallen for some scam advertising or a cheap product that wouldn't work more than once or twice. Boy, was I surprised to find out I was entirely wrong. Unfortunately I've had to use it several times already since I purchased it. Nearly every time it fired up the car better than the fairly new battery in the car does when it is fully charged. I've used it several times in a row without a recharge and each time it provides all the power needed. That's proof that it doesn't need to be recharged after each use. The only time it failed to get me started was when my battery had been discharged to 0% - totally dead. But that's to be expected and the instruction are clear that it is not intended to do this and will not start a car with a fully discharged battery. The booster comes in a very nice and attractive carrying case which would probably fit in most cars' glove box. What I don't like about the unit is that the cables are separate from the booster itself and must be plugged into the unit before each use. At night this can be very difficult to find the receptacle and align the plug. The instructions prescribe a certain sequence for connection too which I do not recall at this time. You must either plug the jumper wires into the unit first or connect them to the car first before turning the unit on. I can never remember the sequence and it is not printed on the unit itself as a reminder. I haven't noticed any difference in the way it works between the two methods so lately I have been plugging the cables in first and then attaching the positive cable to the battery followed by the negative. When I do this the unit powers on by itself and is ready to go. Another complaint is that it is difficult to repack the unit, battery cables and accessory into the nice little carrying case so that you can zip it up closed. There are two or three compartments in the bag for stowing the items. It would be much easier if there were only two (one for the unit and cables; the other for accessories) or none. Recharging is done via USB so you can readily plug it into your car's USB port or use an adapter to use the car's power outlet. Then as you drive along it will recharge the unit. That's convenient because then you will always have the unit fully charged and you won't be forgetting at home or office because you left it there to recharge. So, there are some things that could be better but for a savings of more than $200 it still does what it is meant to do - jump start your car - as well as any fancy high-priced unit on the market. In fact, the battery went dead while my car was in the garage for an inspection sticker. The owner used my unit to start my car because his was not fully charge and was too inconvenient to get to. I recommend this product base on personal use and great results.

### ⭐⭐⭐⭐⭐ Reaaly works!! BELEIVE the mfgr'r's claims!!
*by J***B on July 27, 2023*

This is a long, involved Review. So... be patient. I bought this Gooloo unit exactly 30 days ago. Today provided my first opportunity to test it out. Background: I'm a 74 yr old Disabled/Retired Senior; confined to a wheelchair. I live off of my monthly SS check; so, limited income/essentially no savings. I live alone, ~ 60 mi. S. of Abq., NM; and make one errand run into Abq., each month - ~ 140 mi. round trip, with the around-town errands included. I put less than 1500 miles on my car, per year. I inherited the car when my mother died in 2010. The car is a 2002 Pontiac Bonneville; so, closing up on 21/22 yrs old. The stock battery lasted 15 yrs, but I've had ongoing dead-battery issues, since. I've put in four NAPA-grade batteries in the last 7 yrs, or so; two, new (at ~ $200 a pop), and two under limited warranty replacement (~ $80 a pop). The battery lives under the rear seat, and, what with the nature of my handicaps... it's pretty much a quite considerable pain for me to replace one. Over the last 7 yrs, the car has suffered from some sort of unidentified, intermittent drain on the bat, that deads it out maybe six to eight times a year. I suspect something like a malfunctioning trunk light switch, but have never been able to nail down the exact issue (I rmv'd the trunk lamp/bulb, but still have the issue; so... go figure). Anymore, I ck the battery once or twice a week; but still run into the dead bat issue, all too often. Unfortunately, before I discover it so... the battery often sits dead for several days or more; sulfate'ing away, all the while; i.e., getting deader & deader each day, before I actually discover that it IS dead. If dead (sulfate'd) for too long (a week or two?)... the bat is unrecoverable; and then requires replacement. I have multiple, high quality bat chrgrs, but, if the bat's been sulfate'ing, it can take up to several hours, or more, to get it to accept enough charge to (barely) start the car. I have no garage, so the car lives on the street, out front; and it is not practical to use a Battery Tender/trickle charger on it (pwr cord/public sidewalk/safety issues). When I think the bat's getting marginal, I start the car, and run it for 15 minutes, to top off the bat. Background, complete. In reading the Amazon reviews (and some from other sites) I noticed a couple of reviewers lambasting the Gooloo unit(s) for having a small, actual AH (Amp Hour) rating. I had already been wondering how SUCH a small unit... could start a car; much less, the over 60 times per charge claimed for this unit (and, that, at ONLY 50% or greater retained charge [not supposed to use it to jump-start, at all, below 50% charge]). In the specs, this unit is rated at ~ 98 WH (Watt Hours). No actual AH (Amp Hour) Rating is provided. I've been in electronics all my career, so have the wherewithal to apply the appropriate math to the issue. 98 WH IS a tad under 8 AH; just as the negative reviewer(s) were/are claiming. It appears, however, that they were wanting to use the units to run some sort of meteorological/ecological instrumentation setups (?); and, sure enough, only 8 AH is hardly going to get that sort of job done! So... how does this all compute? A little more background is needed, here. Mfgr's commonly use a procedure called 'binning'; essentially, dividing the production line output into, essentially, Good, Better, Best ratings. Three-level binnings are common, though you can obviously go further; until reaching the level of full rejection/unacceptable performance/failure. I literally have dozens of Makita brand, battery operated tools; and have something like 37 batteries for same, in two sizes (AH Ratings). Most are fairly old, the oldest being in excess of 15 yrs. I used to pull all the bats every six or eight months, and run them all through my chargers. However, I found, over the years, that they (unless the bat/unit had been recently/heavily drained) typically achieved full charge in under five minutes; occasionally, as long as 30 mins. Commonly, though, most of my Makita bats reach Full in under 30 seconds!! (basically, the ones that have been sitting in unused tools - as long as a year - or more). Anymore, I run the Kita bats through the chargers only on an annual (or, longer) basis. And... with the same consistently impressive results! They REALLY hold a charge well!! This is a good example of First Binning lithium-ion cell selection (a 'battery', by definition, being comprised of multiple 'cells'); i.e., the batteries only contain the highest quality cells. At the other end of the spectrum, are the bats for my Ryobi brand tools (Home Depot). The Ryobi tools are incredibly cheap, and a 'relatively' good value; even if you just use them up to destruction, and then simply buy new replacements; as I've read some construction workers claim to regularly do. Unfortunately, the Ryobi batteries are the complete opposite in value. I quit buying them after eight batteries (I've had to toss out two, and have two more that are minimally functional/very difficult to take on a charge). Unlike the Makita bats, the Ryobi bats are only avlble from Home Depot (no where else - like at Amazon, for instance). Further, they charge $80 per bat, and are never discounted. Of my six remaining Ryobi bats, ALL fail to hold a charge for more than a month or so; and several, won't even hold a charge for a week or more. Further, unlike the Makita bats, they also don't seem to perform anywhere near their AH Ratings (also, compared to my Milwaukee tool bats). Though, I'm simply too lazy to have actually run AH Rating analysis on them (fixed resistor load, over measured time, to a set level of discharge). This is an obvious example of Third Binning (or, worse) cell selection. I might also note that this is old history. I recently noticed that Ryobi has newer lines of their bats, that appear to (possibly) be of better quality/value. But, having been soooo burned, in the past... I've not invested/investigated, further. Nor, plan to. When Milwaukee started up in competition to Makita's battery line(s) of tools, quite some years, back... I encountered multiple quality issues with their batteries, too. I had to toss several, as completely unusable/failed. That's when I discovered that procuring individual replacement cells, with which to change out the dead cells/repair the battery, was actually more expensive than simply buying a new battery!! I'd guess, when they were starting out, that Milwaukee was using Second or Third Binning cells. But, over time... as I replaced the trashed bats with newer ones, I think they had realized their error, and had moved up to using First Binning cells; as, from that point onward, and, to this day, I've had results with their bats, similar to the excellent experience(s) I've always had with my Makita bats. So... a large, 8-cylinder ICE-type engine's starter, as I recall, typically draws several hundred amps off the battery, during starting. Just for grins, and ease at math being done in my head, I use(d) 333 amps as an average draw. Obviously, with smaller engines/starters, the draw will be considerably less (or, somewhat more, in the case of a BIG truck's diesel engine, say). My car's engine is a 6 cylinder; so, maybe around 200 Amps, max? Assuming an engine is in good tune/shape, a typical start takes 3 seconds, or less. Say, five or six, if the engine is 'less than optimal', for what ever (hopefully, temporary) reason. Soo... 333 Amps, for three seconds, computes to roughly 0.1 AH draw (load). Thus, at the above loading level, dividing 8 AH by that 0.1... will yield '80 starts'. But, limiting to 50% Gooloo battery charge, and, just for grins, assuming linear performance from said battery, say... 40 starts. Then... figure that, most often, many starts take LESS than one to two actual seconds (time it off in your mind, then compare to your usual engine starting time duration experience). So... boost that '40 starts'... up to 60 starts. Which, in actuality, isn't at all that unreasonable a claim. That all assumes the Gooloo battery IS capable of a very high, short-term current (Ampere) output. How to assure that? First off, use ONLY the highest binning cells for the batteries. Likely, they even use 'special' cells; designed and selected for extra-high amperage output. Then, instead of using only one or two spot-welded straps to interconnect each cell to the next one, let's assume double, or even triple the number of straps. And/or, to further augment high current capability, assume usage of much heavier (lower current resistance) straps. Then... lets maybe assume using the types of cell construction developed for the electric car industry (obviously, high-quality, high-current-drain-capability cells needed, there!). Or, equivalent. And, thennnn... lets include enough cells in the battery (in series, that is - the voltages adding serially) to have a higher output voltage (often analogized/compared/equivalent to water pressure, in a hose); so as to more easily drive/supply higher current (volume - i.e., G.'s per minute of water) from the battery. I measured the output of the Gooloo unit I have; and it measures over 16 Volts (unloaded). At 3.7 Volts, nominal, per lithium cell (up to 4.2 Volts, fully charged), often mfgr's will claim 12 Volts, off off 3 cells in series. Better to go with four cells - 14.8 Volts, nominal. So, at 16+ Volts measured... maybe Gooloo uses five cells in series; or, perhaps, one of the alternate lithium chemistries (such as lithium-phosphate) - resulting in slightly different voltages per cell, and a slightly different total, for the overall composite battery. Add all this together... and I can understand how such a small battery (8 AH) CAN easily start a car. And, often... say, 50 or 60 actual jump-starts per charge cycle. Now... how did all this work out in my ACTUAL experience, today? To start, my battery was 'dead as a door nail' - i.e., deader than dead. Nada. Wouldn't even allow unlocking the door(s) (or, gas cap cover/opening the trunk) from the remote fob. Arrgghh! So... a prime case with which to test the Gooloo. I didn't want to pull the rear seat, to gain direct access to the battery, so popped the hood, and connected the way I usually use one of my battery chargers to try to recover/charge the dead battery - connecting the Gooloo's Black lead/clamp to a bolt on the engine's alternator mounting assy, and flipping up the plastic 'safety cover' leading into the primary fuse box's incoming 'Plus' terminal (my car has a secondary fuse box, near the battery, under the rear seat. Go figure.), to connect the Gooloo's Red lead to. Since the bat was soooo dead... and as outlined in the Gooloo's Instructions... after obtaining the Green light on the jumper cable module as blinking... I pressed the little nearby 'Boost Button'... and got a solid Green. As soon as I had connected the Gooloo, and prior to pressing the little button, all my running lights and such, had lit up merrily bright. 'Encouraging!', I had thought. But, when I got in the car and hit the starter... all I got was a short 'blip' - no starter turn-over - and... all the lights went out. Grumble, grumble!! But.... I certainly wasn't ready to give up. Yet. I got back under the hood, and checked my connections. When I jiggled/ck'd the Black lead... I got sparks! Indicative of an inadequately secured connection. I made sure it was WELL clamped in place, this time, jimmying it about as bit, so the teeth of the clamp could pierce through any oxidation on the bolt-head I'd chosen. And... all the lights came back on - brightly! THIS time... when I hit the starter... the engine spun enthusiastically... and - 'Vroom'! - started right up! Happy camper, I!! :-) :-) So... I am VERY confident & happy, now, in/with my Gooloo unit. And, by my above suppositions and calculations... do not doubt the claimed '60 jump-starts' being advertised/claimed for this unit. I'm impressed with the Gooloo in ALL considerations (as so well detailed/outlined by the other reviewers). HIGHLY Recommended!! Addendum: It's about ten days later from the above, now. Once again... grumble, grumble... my car's bat is all sorts of dead. Only this time... the Gooloo couldn't start it - at all. I had noticed that Amazon had posted my Review as the 'Most Positive' review. I hope it stays that way, as I am still feeling very positive about the Gooloo unit; but... now having encountered some real world limitations to it's 'practical' usage - thought that they were worth being noted, here. I had also noticed that the 'Least Positive' review had complained that the Gooloo was unable to start his vehicle, when he had a very dead battery. Considering my success with doing just that (in the upper/first part of this review), I was a bit... puzzled/surprised. Well... no more. Apparently, earlier, I DID have a very dead battery; but... no where NEAR as truly double-dead-dead as with this 2nd attempted use of the Gooloo unit. As before, I had connected the Gooloo, engaged the 'Boost Button', and got (external) running lights; but lost all, when I (unsuccessfully) tried to start the vehicle. Just got nothing; no starter turnover, and 'lights out'. The Gooloo went from Boost Mode, back to a blinking green light on the jumper module. Tried it several times; same, each. Arrgghh! However... I did recall that the instructions advised letting the Gooloo be attached for a few minutes PRIOR to jump-starting; which I had been knowledgeably/purposely been avoiding doing, as I had been more interested in subjecting the Gooloo to worst case, 'street' conditions/usage. Well... things just got even worse for it, this time. Sooo... I decided to let the unit hang onto the car's bat, and transfer some charge into it; in hopes that that would enable the Gooloo to, a little bit later, jump start it. Fortunately, all this is/was going on at my residence, not 'out in the wild'; although that was exactly why I was trying this particular methodology out - like this, here & now. In watching the unit, I noticed the green light cycling - 6 seconds On, one sec Off, then, repeat; consistently. After having gotten bored watching that, I moved over into the shade of the building; from which vantage (out of the bright [hot!] sun at the front of the car), I was able to observe the rear running lights. Which were bright for four secs, dimming to being out completely, over the next 2 secs, remaining so for the 1 sec the jump cable module's SoC ('Solution-on-a-Chip' - the industry's nomenclature for a custom-designed, single-purpose IC chip) was using to Reset itself, each cycle, and then repeat - over & over. So I felt confident that the Gooloo WAS transferring charge into the vehicle's battery. (Which did, indeed, later prove to have been the case). After all was over, I plugged the Gooloo unit into a charger, via USB-C. Before, the unit was showing 2 solid bars (when I disconnected it); now, while initializing charging, it had 1 solid bar, and was blinking the second one (later, progressively, the 3rd and 4th ones) - thus, my conclusion that I HAD xfer'd OVER half the Gooloo's charge into my car's battery. BTW, despite being connected to a 50W charger/wall-wart, that I often use on my Samsung S23 Ultra cell phone, the Gooloo took 5 hours to reach Full charge; thus leading me to the conclusion that the unit's firmware does not honor/recognize Hi-Speed USB charger protocols (perhaps introduced AFTER the Gooloo's design phase had been locked in place?). But... after 15 minutes of charge xfer time had passed... the Gooloo still couldn't start the car. When I disconnected it, I noticed that the Gooloo bat's power indicator showed 2 bars (see above); indicating it HAD xfr'd some energy into the car's bat. A bit over half of the Gooloo's 8 AH capacity, as DID actually prove out. And... the instructions DO state NOT to try jump starting below 50% charge (which this unit WAS at, at that point). So... maybe... had I only xfer'd charge for, say... 5 minutes?... MAYBE... the Gooloo (being at over 50% charge, at this 'conjectural' point in time) WOULD have successfully jump-started my car. I'd like to think so; and, if similar circumstances present again, in future, will test out such. Back to today... I then set out my safety cones, ran out an extension cord, and hooked up my (larger) car bat chrgr. Which, like so many things, today, is waaaay over-software-engineered; meaning that all the supposed advantages to doing so, during the design phase... often result in annoying, real-world limitations, in day-to-day usage scenarios. Which, in this case... the charger wanting to see at least a FEW volts on the battery... often leading to hassles getting the durned thing to actually charge the battery at all - when encountering a very dead one! Fortunately, however... in THIS circumstance... it read out 4 Volts present in/on the car's battery; thus verifying the Gooloo's energy xfer. I let the AC charger do it's thing for about an hour... returned to find that car's bat at ~ 11 Volts, and maybe 35% charge, and, then, managed to successfully start there car. WHEW!! So, for 'normal' dead battery issues, and with an otherwise viable, healthy battery... I feel the Gooloo unit is STILL to be Highly Recommended. However... when encountering VERY dead/unhealthy-unhappy/compromised batteries (like mine was/is)... it would be wise to be aware of the above limitations. Best of luck to you all.

### ⭐⭐⭐⭐⭐ Works great as a jump starter—the device charging options are an additional plus.
*by T***F on December 25, 2025*

Excellent jump starter. Easy to use. Well made. Neatly designed and fits well in its clamshell holder. Already used it the first week we got it. Sent one as a gift to my brother first, and he loves it. Not only has he used it for his own vehicles, he's helped others on the road. The USB and cigarette lighter charging options are icing on the cake.

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