YONHAN Battery Charger 10-Amp 12V and 24V Fully-Automatic Smart Car Battery Charger, Battery Maintainer Trickle Charger, and Battery Desulfator with Temperature Compensation

I have purchased several of these chargers so that I can basically leave them as trickle chargers on a couple of my vehicle batteries. They are quick and easy to connect properly and do a very good job of bring your batteries up to their full potential. Understand that you cannot charge a completely dead battery. There must at least a small amount of juice left in the battery for the charger to start its programming. It's been about a year and a half since I bought my first one of these. It has continued to function very well so I'd say the quality and dependability are great with these chargers. So I recommend them if you want a quick and easy to use charger for your vehicle batteries.

Bought this just from what the description of it claimed to do, and to my surprise it actually works fantastically. I had a car I don't drive much sitting for a long time hadn't started it for awhile when I needed to use it of course the battery was dead. So I bought this to see if it could rejuvenate my battery attached it and read the instructions chose which cycle I wanted it to preform and let it do it thing. It's not super fast but 14 hrs later it finished rejuvenating and to my amazement the battery was fully charged cleaned and restored. My car has started ever since over 8 months ago.

returned home after 6 months to a TOTALLY dead battery in my car. trickle/maintainer chargers wouldn't engage, need a smart charger with 'repair' mode. paid $5 for 3 hour delivery, it came in 2. 3 hours of 'repair' mode later, my car started. charged the battery overnight in 'standard' mode. all is good. very pleased.

Incredible product, with many modes except its has (1) major weakness. It has multiple modes but unfortunately the info display has NO BACKLIGHTING making it very difficult to check and see what mode the charger is in. Fix the display, and the product should be a big hit and seller.

This worked so well I had to come write a review. It charges really fast. Love that it displays your battery percentage as well. Went from 40% to 100 in about an hour and a half. Most other 10 amp chargers were $60 to $100. This thing's an amazing value

My 6-year-old Audi Q5 can start OK, because it has a strong starter (has auto start/off) but because of it's low state of charge, that function no longer works. I bought a trickle charger before this one which charged well on a 2019 Corolla that's being driven very little and infrequent but not on my 2018 Audi Q5. That other trickle charger charged my battery from 11.7 to 11.9V. I bought this charger due to it has a separate mode for AGM and Repair because my Audi battery is AGM. FYI, manual says you need to wait at least an hour from the last usage of your battery. So, I first charged it in the AGM mode and the display went from 50% to 100% in only 10 minutes but the voltage only improved to 12V. Yesterday I put it on repair mode, and it took 8 hours to show full. I did not wait for it to turn off by itself. The battery now has improved from 12V to 12.55V; from 50% to 80% capacity on a 6-year-old large AGM battery. I did not bother to remove the power cords due to my bad back and the battery is situated in the trunk all the way behind the backseat. Luckily it does not appear to cause any damage to my car. During the repair mode, I monitored the battery temperature with my laser thermometer; the charger nor the battery did not get warm and stayed in the low 70's. PROS: 1) Has separate AGM and Motorcycle and repair mode. 2) Great LCD lighted display will show the battery level when you hook it up even before you plug in the power cord. It will also show charger temperature, charging current & status, battery voltage & etc. 3) Smart charger has a built-in fan to stay cool and it will alter the charging power with respect to the battery status. It will start out slow and rarely goes to the full 10A, then it will decrease the power when you reached half full then even lower at 75%. Even when it's @100% charged, it will trickle charge to the max then turn itself off (fan off but light still on) and display OFF. 4) Great repair mode that reconditioned my 6 year old AGM battery from 50% to 80% capacity. 5) Very good price; I paid $24 shipped. CONS: 1) Very short cord, you will need an extension cord. But it's no big deal. 2) Per owner's manual, in Motorcycle mode, it will charge battery to full then turn off and turn back on when voltage drops below 12.5V. But does that mean you cannot maintain your battery in the other modes? It also states not to leave the charger unattended over 12 hours. Therefore, I don't think this is a battery maintainer which is fine for me. ................................................................ With this battery charger, I can charge my batteries before and after I go on a vacation and let not my batteries charge level go down too low thus prolongs the life of my batteries. I only had it for a week and so far, I am very happy about this product. I will update if the charger quit or have some problems.

Works perfectly great.

As a single mother who isn’t great with car repairs, I constantly need to find ways to save money, especially since I often can’t afford costly shop visits. This YONHAN Battery Charger has been a game changer for my older vehicles since early this year. It’s affordable, easy to use, and has already saved me a lot of money by reviving weak batteries at home. I like that it has clear instructions and easy-to-read screen, which shows all the essential information during charging—perfect for someone like me who’s not mechanically inclined. I actually own a more expensive charger, but I find myself reaching for this one more often because of the information on the screen. It's made in plastic material so I did not have any expectation at first but it has been durable since. It has a blower to cool off the charger but to be safe I charge my car batteries under a shade. This is portable enough and does not come with a pouch. For the price, I don't expect bells and whistles but this has proven it's value. While my pricier charger works a bit faster, this YONHAN model is ideal if you’re not in a rush and needs a budget-friendly option. It’s a smart investment for anyone, especially parents or individuals on a budget, who want to extend the life of their car batteries without relying on costly repairs.