I used it on my regular lead acid car battery once and it died on me. For both vehicles. Luckily it was in my parking lot. I had to start with another spare battery. I think it would be good to charge a small cell phone battery? I wouldn't try that again on my car. Maybe I got a defective one, like someone else's review. Maybe it got hot because I kept it indoors on the dash but with the window ajar.
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