Must have gotten a lemon with this one it's been about two months now since I first purchased it, once I received it I charged it up and put it in my truck. I needed to use it on my truck this week stranded with a dead battery. When I got it out the battery was already dead and no way to get a jump. Once I made it home I put it on the charger over night and the next day checked it and it had not charged. Amazon said it's to late to return so I hope the 3 year product warranty will be okay but would not recommend.