I recently bought a GTU 10 from Garmin.
I want to extend it's battery life by replacing and soldering on a new battery and enclosing the battery and the GTU 10 in a 1601 Otterbox.
I would like to be able to charge the new battery through the USB connector on the circuit board, so is it possible to do? What should be the specs on the new battery?
After removing the shell, you are left with a 3.7v, 740 mAh, 2.7Wh battery and the circuit board.