DSR Pro 4000A Heavy-Duty Car Battery Jump Starter & Portable Power Station, 12V DC Charging & 2.1A USB Charging, Professional Grade, for 12V Automotive & Marine Batteries, DSR159

Quality product

It is a must have tool for your car.

We are a professional mechanic shop and have been in business for 21 years now, and this is our 4th box. Previous box is same brand and still works, it's just that the built in 110v plug in charger port for that box (really like that feature, no external charger needed) no longer would charge the box, so we (thought) upgraded to a nicer model (this one I'm writing the review for). Seemed to work great for the first 6 months or so, would even start dual battery diesel trucks with no issues. Then it wouldn't do the diesels every time, we attributed that to "maybe the batteries are just totally dead or had shorted cells" because it worked sometimes. I should have recognized at that point there was something up, but we don't work on diesel that often, and the box was still starting cars just fine.The box stays plugged in whenever not in use (like the instructions stated) and it always says 100% when we go to use it.Just noticed 2 months ago now it will only start something that is partially low, like when you get the starter that just clicks during cranking and will not turn over. Last month, now it won't even start those, let alone a car that had the key left on overnight.I had figured due to the more expense of this box, it should be even better than the last box, but apparently not.Very disappointed. We went back to using the older box for now, have to hook up a charger to the clamps and turn on the box to charge it, but still works, going on 3 years now. Guess they don't make stuff like they used to anymore...

Works perfectly tested it out on two dead cars I have and they fired up with no problems with this jumper

Is a great product

thank you

Holds a charge for three months. Durable product.

Defective out of the box! I’ve had many Schumacher jump packs over the years, and can’t seem to get any help