I see what you mean. I'll put in another battery to see whether it works. Tks!It may be the battery will be dead after a few hours. You pull out usb power cable that time still got power then you turn off, if battery is spoil, after a few hours it auto drain battery finish even if it is switch off. Anyway M10 battery is not that good, it is not suitable to be used in car. It will get swollen after a few months, maybe the battery cannot take much heat because when the cam is on the cam is hot.