20-Amp Car Battery Charger, 12V/24V Lithium, LiFePO4, Lead Acid (AGM/Gel/SLA), Smart Battery Maintainer, Trickle & Pulse Repair, Portable Charging for Cars, Boats, Motorcycles, Golf Carts, Tractors

Works perfectly for charging standard AGM and LiFePo4 batteries. Lots of good info displayed on battery condition, charge rate, and voltage. Five stars. Note that the fan is LOUD.

As you know your old charger won't work on the new Lithium tech battery. Recently I got one..and a super simple charger came with it! That charger worked...but it had no readout at all. So, I wanted something finer and after much lookings I chose 20-Amp Car Battery Charger. I have used another brand exclusively for years.... But that one came with bugs. My new 20-Amp Car Battery Charger, so far, has been flawless. Gives good charging info and works QUICK! Also it has some kind of battery rejuv function. Well, I have a truck battery to go to 0 on me. And it wouldn't fully charge. I ran the restore thingy on my new 20-Amp Car Battery Charger on the thing and wah-lah, the old battery is back 100% again. That alone may have saved me a hundred bucks. This is a good charger! Works with all batteries!

wow! I am impressed, this little charger worked fantastic. Did everything I expected and did it well. Great product

My new favorite charger. I was skeptical that something so small could push 20 amps, but according to the built in display it regularly hits 16A+. The fan moves a lot of air, but I don't think it's unreasonable for such a small package. I can feel it moving a good bit of heat and it turns off when it's not attached to anything.Main thing I'm happy about is it doesn't do a mandatory 10 minute desulfation/testing cycle at the beginning of every charge like one of my 10A chargers does. Sometimes it doesn't matter but sometimes I want to start charging immediately - I frequently use this to keep a car battery from dying when I need to have key on engine off for an extended period. I appreciate having some control over the charge, something omitted from a lot of "smart" chargers these days. I can also select 5A, 10A, or 20A for 12v batteries which is nice. This is exactly what I was looking for.The only con I can think of is that the charge percentage seems to mean nothing and it usually just flashes 80% or 100% regardless unless a battery is completely dead. I can get a good enough idea by the charge voltage and current so I don't mind that much.Update: I see it sometimes pushing 20A, then back down to about 15-16A when the battery is nowhere near fully charged (and can take 40A+ as verified with another charger). I suspect it's throttling itself when it gets a little too warm and could just use a bigger fan but I haven't spent too much time investigating it. I may try giving it some more air to see if it'll maintain a higher current.Also have been testing the repair feature on a couple batteries with issues and have seen good results. It probably can't bring back a trashed battery, but it does seem to help a weak one. I first tried this feature on a Noco charger and didn't notice much difference, but I think that's because the Nocos will turn it off after ~4-5 hours (which isn't the worst idea especially for routine-ish maintenance), while this one will run until you stop it or it thinks the battery is fixed. How does it decide that? No idea, but it's only stopped itself on one battery that I've used it on so far. I let it repair one for ~9 hours a day for a week straight (under supervision!) and saw improvement from ~300CCA to ~550CCA and holding higher voltage at rest.Last thing. I noticed some reviewers mentioned the cables pulling out of the plug at the charger and exposing bare wires, and yes the first one I bought is developing this issue. I'm watching it closely and will be making a repair or retiring it when it starts to get questionable. I've since bought two more of these and noticed the plug has been updated to prevent this from happening. Also my newer ones modulate the fan speed according to charge current (and temperature I assume), so it seems like they've been upgraded all around.Update again: Changing my rating because after buying a 4th one (yeah I know) this version seems to have gone back a step. Will not attempt to charge batteries below ~7.5v, just sounds of relays clicking (which old ones didn't have) then shuts off and says it's full. I originally said the new version doesn't float and that seems to not be entirely accurate, but it is different than before. I'll be doing some testing on that...

Works great works on any tipe of battery very long cords

The media could not be loaded. Update July 24 2024:Today I decided to charge a battery that discharged because I didn't drive the car for a week. I use the 100AH Lithium Ion Phosphate battery in my car to run a 12V refrigerator and noticed that during charging I had a very hard time opening my car doors. My car (2018 Honda Accord) has a key fob that stays in your pocket and you walk up and just pull on the handle and the door opens. Well, this doesn't work when I was charging. I had to unplug the charger from electrical outlet to open the doors. It appears that this charger causes radio interference with car key fobs and I also found out today that my remote thermometer that hangs on the tree outside would not update unit in the home during charging. So this charger is not well designed and causes radio interference. This is the first time I experienced this with a charger.Update Jan 16 2024:I did some more testing. The battery I use is exactly 230 AH (2.944 KWH) in capacity. Using this changer on the 20 amp setting (in reality almost 15 amp) I charged the battery to full. I ran a 10 amp load with a electronic load test device to drain the battery until the BMS (battery management system) cuts off the connection to prevent damage. Result was 230 AH as rated by manufacturer. I used the charger again and charged the battery to full after draining it and getting 230 AH (2.944 KWH) capacity. I measured how much electricity from my 120V AC wall outlet it takes to charge the battery back to 230AH (2.944KWH) and i was shocked. It took just over 17 hours and 3.901 KWH to get the battery recharged. So this charger wastes 25% of AC wall electricity to recharge batteries. I honestly don't know if that is normal or not but one thing for sure is that the fan blows out a lot of wasted heat during charging. I assume there is some loss in conversion but that seems a bit high. I am not 100% sure. I have to lower the rating to 1 star due to not charging at 20 amps and not appearing to be efficient and loud. See my video.Original review Jan 7 2024:This charger falls short on the max amp charge rating. For me charging my 230Ah LiFePO4 battery the 3 charge settings gave me approximately 5.2 amps, 9.6 amps and 14.7 amps. I only got close to 20 amps in the first few minutes of the charge. During the main charge phase it only hovered in the 15 amp range My battery has a recommended charge of 40 amps but charging LiFePO4 batteries at a slower rate will extend their life so that's why I bought the charger. I wanted to use 20 amps. I have not decided if I will keep it.

The media could not be loaded. Great little charger with a cooling fan! It ran at 17 + amps for my new 300ah lithium batteries. Took approx 9 hrs each from 40% full.

Great versatile battery charger - gets a full charge on my lithium iron battery i use for my trolling motor.