Originally Posted by Vineet Singh
After 12 hours, the battery voltage went from 12.75 to 12.39, with just the cars ECU and the USB GPS running. I'll keep you all posted. I have 2 20ah gel cells in parallel to power the car and the carputer (so I think I'll get 35ah out of the deal). As a side note, the carputer takes up 3amps of power to run, including the 2 amplifiers, laptop charger, relay, and 5v powersupply (supplying 1.2amps by itself to the powerhungry audigynx, but with no sound output).