when we buy GPS, we should consider GPS power supply and GPS battery capabilities. since many of time, we use GPS in the car or outdoors, and sometimes in long distance travel navigation. GPS devices designed primarily for in-car use plug into the car’s 12-volt power port. there are car chargers for car gps and bluetooth gps. but for hiking, there are different battery design for the various products. for example: some GPS use the samebatteries as Nokia cellphone, so the Nokia mobile phone users can use cell phone battery …