The GPSMAP 195 has a battery pack that slides on and off the back of the unit. The battery pack has a cover as well that is removed with the latch on the top of the pack. Under this cover, six AA batteries are installed. Garmin does offer a rechargeable Nickel Cadmium (NiCad) battery pack for the GPSMAP 195. This kit can be puchased for an addtional $75. If you do not opt to purchase the NiCad kit, we recommend purchasing an additional battery case for $20. With this, the user can fill another battery pack with batteries and have a spare battery pack that can be replaced quickly and easily.