I got a budget Dragon Touch M8 tablet to use as a GPS/Bluetooth OBD and it does it perfectly except for the battery. I leave it in my car overnight. After night 1 of standby, the battery is fine. It is fine all day too and charging when the car is on. Then after night 2, the tablet is completely dead and won't turn on until an hour of charging where I have to bring it in my house to charge. Does anyone know what is eating all the power when the device is on standby? I close all applications but that doesn't work either.