Reduce battery costs by powering devices with rechargeable batteries. These batteries work well in high-drain devices such as GPS receivers. When choosing a battery, use the capacity, measured in milliampere-hours, to compare among similar sizes. The higher the mA-hr. rating, the longer the battery should last.

Nickel metal hydride (NiMH) batteries last longer than nickel cadmium batteries. Recharging without completely draining first does not affect battery life.