I've had this for over a year now and it's still working. I used it with 5 batteries and it saved all but one. What I knew was thrown away, just tried. The first test was for a lawnmower. He ran it on full charge three or four times. After two discharge cycles with a desulfator, that's more than ten starts. I've never tested it other than that, but it works like a new battery should. Second, it's a car battery. There's a gremlin in this car, to be honest, but the battery desulfurization solved enough problems to diagnose the real problem. (blurred ground on alternator) Next up was the motorcycle battery. I decided to give it a try. I didn't know the age or history of the battery as the bike was bought used. This is a sealed AGM battery and makes a world of difference. If I left the ignition on for more than a few minutes. This would slow down the start. If I didn't drive him long enough to charge the battery, he would die. Now, after several desulfation cycles, it works like new. I bought a new battery just in case and replaced the old one with a smaller 250 (no risk of getting stuck, 650 is a daily driver). So far, so good. Risen dough works at 250 for days. I tweak the carbs and it takes a lot of starts, restarts, starts and restarts. Conclusion: if the battery can be saved, that's enough. If it can't, then it won't. But a few bucks to save you from spending $80 or more every time your battery dies is worth it. Especially if you're like me and own 20 battery powered ones. (insert time when the instrument is humming)
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