An electrical device used to charge rechargeable batteries. Chargers come in a variety of configurations, depending on the need. Many chargers are limited to certain types of batteries (such as NiCad, NiMH, or LiPo), or a certain number of cells. Chargers range in complexity from simple adapters that plug directly into an outlet (overnight wall chargers) to Multi function units that discharge, condition, charge, peak, then maintain your cells according to your settings. There is probably even a charger out there that will nuke your Hot Pocket while you wait for your cells to peak.