I charged a 12v car battery for over 24 hours before the green light came on to indicate the battery was fully charged. I tried to start the car and barely started the engine. I ended up sending this gadget back because it didn't suit me. To be honest, the battery was probably completely dead and no matter what charger I use, the battery never worked. I love this gadget because it was very durable and so easy to use. I think it would work great if only my battery died. Considering the price and what I consider a very high quality product - materials and design - this is a great tool for those "just in case" moments.
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