Bought to charge my car battery because it was too low to jump my truck. When I plugged it in it told me the battery was full so I used pulse mode to recover the battery and then ran actual charge mode and it worked amazing! Out of curiosity I hooked it up to my super old battery which has been dead for 2 years and is lying on the garage floor. I ran the pulse/repair a few times over a couple of nights, then ran the actual charge, threw it in the car and it immediately caught fire. Checked the last few days and it starts every time π€£π. Such a great review from me!