YONHAN Battery Charger 20A 12V/24V LiFePO4 Lead Acid Fully Automatic Battery Maintainer, Car Battery Trickle Charger Automotive w/Repair, Winter Mode, for AGM, STD, Gel, Deep Cycle Batteries

Extremely easy to use. Lightweight. Self-cooled and still reasonably quiet. It also measures ambient temperature, to help manage battery charging rates (cold conditions == slower charging rates required). We have a high confidence in this unit; it does indeed seem reliable. We needed a battery charger that was compatible with an AGM battery. Per the battery’s manufacturer, our older charger might not have been good/healthy for the battery, noting that the voltage outputs from ‘older’ chargers (the big, heavy, can ones that some people have used for years and that we’d inherited from our parents) might risk damaging something (due to the potential for excessive output voltage delivery) and that AGM batteries, at a within-sensitivity-spec managed voltage can accept higher amperage charging and charge at a faster rate. Plugged this unit in to give it a try and just become familiar with it. That took only a few seconds to get comfortable with it, and the manual (which does take a few minutes to read) provides very clear information about the deeper details (of what the charger’s indicator’s abbreviations mean and what to expect from each of the selectable cycles). Tried a charging cycle on the battery and figured that it probably had a bad cell and had failed. Our battery tester didn’t see enough energy stored inside of the battery and would not yet give an official “Replace” indication; instead, it asked to charge it more so that it could fully test. So: Attempted a Repair cycle on it using this charger (though the instructions said fairly clearly that a bad cell inside of the battery would thwart its efforts). Impressively, upon completion of the Repair run, the battery was then able to absorb enough energy to get a “NoGo / Replace this battery” indication officially from our testing device. Replaced the battery (installed a new one), then used this AGM-ready charger to bring the new battery from ~85% charged up to fully-charged. We liked very much that this charger unit is versatile enough to perform Repair attempts, charge batteries straight-out, that it can handle Standard, AGM, LiFePO, Gel, and others, and that it can be expected to automatically regulate the proper voltage for output within specifications and vary amperage output based on ambient temperature and how rapidly it expects that the battery can absorb the energy. .:.Our confidence/trust in this unit is very high. Its performance is exceptionally nice. We love how compact it is, especially as compared with our older ones, and also how lightweight it is. And that it’s self-cooled (with its built-in cooling fan) and that it is impressively easy to use. Also that, after its charging cycles, the charger runs a testing process to confirm that the process went well.

Absolutely in love with Younhan 20A/12V Fully Automated Battery Charger! It is a lifesaver for those who need a powerful, reliable, and intelligent charger, especially for larger vehicles, such as SUV, truck during the cold weather and deal marine batteries with ease. it’s strong charging performance, winter optimization, and long-term maintenance capabilities make it unique and very safe since its includes multiple built-in protections that reduce the risk of damage to both the battery and the charger. Charging capacity is much more powerful than typical 5A or 10A maintainers which allows to reduce charging time for deeply discharged batteries as well as charging large car batteries faster. The size is perfect and can be easily stored inside the vehicle during the day and takes less space in garage/ closet. The Winter Mode is particularly useful for users in cold climates snd adjusts voltage automatically for cold conditions. It is easy to use and display. Once the battery reaches full charge, the Younhan charger automatically switches to float/maintenance mode. Providing service to AAA members, I use it daily and very satisfied with the quality and price!

Awesome charger at a great price. Covers all the bases. Much faster than on board chargers.

I bought this charger to replace my 6 amp charger that I tried to use to charge my off grid solar battery system when it was foggy and cloudy for over a month. This Yonhan unit was able to charge my 4 golf cart batteries when they were about 40% down. It took most of the day but did successfully charge the batteries back to full power. Only problem is that I never was able to charge at a rate over 14 amps as measured by my quality clamp amp meter even though the charger display showed 17.8 amps. I suspect that the unit could have charged my system at a rate of 15amps if needed. It may charge at a higher rate with a different system, but 15 amps is good enough for me. The plus is that when I switch to a LiFePo4 system it will also work for those batteries.

Although less than 3 years old the battery in my lawn tractor died. My 25 amp charger couldn't charge it at all and my battery tester said REPLACE. That was going to cost $70 but I had read about battery de-sulfating chargers so decided to give one a try and bought this for $50. It uses high current pulses to clean lead sulfate contamination from the plates. I hooked it up and selected Repair mode - (shows PUL for pulsing on the display). It takes quite a while - 16 hours according to the manual - but the next day the display showed "End". My battery was completely restored and fully charged - actually better than its original specification of 350CCA (cold cranking amps). My battery tester now measures 392CCA. See my before and after photos. I'm delighted with this unit and haven't yet tried normal charging.

I purchased this charger to keep my batteries topped off and maintained, and so far I’ve been very pleased. The build quality feels solid for the price, and setup was straightforward—plug it in, connect the clamps, and it goes right to work. The charging indicator lights are easy to read, so I know exactly where the battery stands in the process. Performance-wise, it charges at a steady rate without overheating, and I’ve noticed my batteries hold their charge better since switching over to this unit. It also has a smart-charging feature that prevents overcharging, which gives me peace of mind when leaving it connected for longer periods. The only minor drawback is that the cables could be a little longer for more flexibility in tight spaces, but that’s not a deal-breaker. Overall, this charger delivers excellent value for the money. It’s dependable, user-friendly, and does exactly what I bought it for. I’d definitely recommend it to anyone needing a reliable battery charger.

Easy to uses and works great

Good unit, case lightweight

Was able to charge my car with it. Case is plastic and charge cables are plastic as well not rubber and not flexible outside in the cold.

This handy leaf blower works great as bought in yesterday. Wish the price can be cheaper due to its old model. Overall. I like its performance. Thanks

Good Product. Connect it to the car battery all night during extreme cold conditions.