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

My car was parked outside in the winter, and the battery was completely dead. I jumpstarted the car, drove it for a while, but it wouldn’t charge at all. I thought battery was completely dead and I will have to buy a new one. Even though my battery was under warranty, last invoice and they wouldn’t replace the battery without the invoice. I was in a tough spot. Wild browsing I came across this Charger. Not only charge the battery. The repair feature completely repaired the battery and now it’s working as a new one. I had one more old battery laying around in the house, waiting to be recycled, just to test. I hope this charger to that battery, and This charger not only repaired the battery and now it’s functional as well. At AutoZone and Toyota told us the battery was completely dead when they tried to charge it overnight.So the bottom line is, either These dealer are just trying to sell us stuff that we don’t need, or discharge is just super amazing. Or both.

Forgot to disconnect the batteries in our golf cart for the winter, attached my old battery charger, which I have used for my motorcycle and suv, and it worked fine, but when I hooked it to one of the golf cart batteries it didn’t charge it, so I bought this system to try and bring them back. It worked! Didn’t take too long. Did all four 12v batteries, one at a time, in less than 2 days.

I admit I do not know much about restoring power to a dead battery, but mine died and I didn't know what to do so I read the reviews and decided to get this charger. It was very simple and didn't take very long and my car is up and running. Fantastic and worth every penny! Fantastic power.

This is an incredible piece of technology. I did not know there were such things as "smart" chargers. I thought for sure I would have to buy a new battery. After I hooked up the charger, it went through it's start-up procedure and then went into repair mode. It was on all night and the next morning I had a fully charged and repaired battery. This is a 12 volt battery in our Yamaha golf cart. It's now been around two weeks ago and all is well, the battery is holding its charge. I am amazed a charger could do a battery repair. I highly recommend this product. Saved me a lot of dollars.

Good reliable charger for multiple battery types. I use this to charge my 12v ham radio field batteries and it works great. The included clips work well but it is also easy to modify for different connector types if you need. Unit stays cool with the built in fan and the unit will power down when finished giving good safety.

For being so compact I am very impressed how well this works. Needed to charge my 2015 Jew Cherokee battery because I haven’t been driving it that much and battery was dead. This had no problem charging it. Not worried anymore when I go somewhere wondering if my jeep will start

It has extended the life of a couple of batteries but doesn’t work miracles. I have one battery that hasn’t been fully charged in about 2 years and so far I’ve had no success recovering that one. I have not tested the trickle charge feature. I’ve had no issues with the controls or setting/changing functions.

I had an old desulfator, which had saved a couple of batteries over the years. Unfortunately, it stopped producing results, so I purchased this one!The battery I'm working on has been sitting unused for a long time. It initially tested bad at 0 CCA. After purchasing this tool and going through 3-4 complete repair cycles over a few days, it tested good and is up to 475 CCA. It seems stuck at 475 CCA, but I won't give up there.The battery is rated at 650 CCA, so I removed the top to examine the cells. One cell is less filled than the rest, so I will top it off with distilled water and throw this tool back on it to see if I can get it closer to the original rating of 650 CCA.Unfortunately, after topping off the cell and a week of using repair mode off and on, I still could not get any more CCA out of it; that cell is definitely dead. This is an excellent tool for keeping your batteries in good shape, but be aware it cannot bring a dead cell back.