Black & Decker BC25BD Fully Automatic 25 Amp 12V Bench Battery Charger/Maintainer with 75A Engine Start, Alternator Check, Cable Clamps

Great quality and works well and fast charging for my boat battery, gave 4 as it only comes with 110v power and we use 220v so had to buy a power converter

Had a Cat with similar specs prior and in my opinion this is a better charger. I have used the desulfate feature successfully to restore a couple of weak and seldom used car batteries, they are working for me again at -30C. The charging pattern changes with the state of charge and seems to top up batteries very well. I like the monitor as well as the cables. The booster does work but is sized for a light car or truck, too small for heavy equipment. At twenty amps there is not a long wait to bring up very large batteries any way. As with all smart chargers it will not charge a stone dead battery but this one will apply a boost which may kick it into a high enough level to start a charge in the case of a total drain such as leaving lights on overnight. Otherwise you need an old style transformer type to bring a stone dead battery into a chargeable state, then this one will safely fully charge anything I have put to it. As with any charger ensure your batteries have proper electrolyte level and are not frozen prior to attempting a charge.

I already purchased the lesser amp version and it works flawlessly, finding the need for another variable charger. I bought this one which has a 75 amp jump start, a bit more power couldn't hurt right. So lets start. Attach to the battery and hit charge it reads the battery and then slowly begins to charge adding amps over a few seconds until it is at full power then showing the % of charge. Give it some time come back and when at 100% it automatically goes into "FLOAT" keeping the battery at 100% Very happy with this, if you need a charger this is the way to go.

Entrega rápida y producto en buen estado, en su primer uso resultó excelente hasta el momento no he visto o notado algún defecto en el producto, muchas gracias

Nothing to dislike, except that you can't set the charge rate. It will "read the battery" and determine the optimal charging rate. An adjustable max charge rate would have been nice, as I'd prefer not to have to trust my battery to it's digital brain. But, that being said, it wasn't a deal breaker. As others have noted, it won't "see" a battery with less than 3 or so volts. If a battery is that flat, just toss a set of jumper cables on it from a good battery to bring the voltage level up to a level that will work. It's not "seeing" the completely flat battery is just proof that it's tiny digital brain is protecting the charger and the battery from potential harm. For the price, you can't go wrong!

My farm truck has a lot of electrical problems and the battery likes to die. I don't drive it enough to keep it charged up so I have to jump it a lot. I was tired of that, so I bought this to see if it would fix my problem. Things like this aren't really intended to use with an extension cord, but I didn't really have a choice. At first, it would start charging, but then it would give me an error and quit charging after a few minutes. I got a heavier duty, shorter extension cord, and then quit getting the error and I was able to get it charged right up. The smart charge feature has worked fine for me, it starts dropping the amperage as it gets closer to full charge and then goes on a float.