Yes and no. Yes, Bluetooth devices CAN run for a long time off of batteries. But, NO, not exactly in this case. If you are using the GPS, it is going to be streaming the NMEA data at a pretty continuous rate. That will take battery. The Bluetooth devices that have a really long battery life are not streaming constantly. They are in Rx mode most of the time and Tx mode is a short duty cycle. Trust me. I test these devices in a SAC (Semi-Anachoic Chamber) day after day. When I test such radios, I need to have a pile of fresh batteries to get through an evenings worth of radio testing. I seldom get 2 hours of battery (small button battery) with a radio transmitting continuously.