I've had this device for about 6 months and rarely use it except when on the road. I was driving yesterday and it just quit working. I was surprised since I never saw the green light change to orange or red. When I got home last night I put that battery and another one that needed charging, on the charger overnight. I tried both batteries this morning and the light doesn't even blink when I close the battery door. As expensive as this bugger is, I'd expect it to last much longer than this. These are the correct batteries for this device and the device has never been dropped.