Panasonic USB Charger for AA and AAA Black BQ-CC91AM-K Input/Output Batteries,

Rechargeable batteries via USB. Features sensing charging function (backup charging function, prevents charging of dry cell batteries). Features mobile functionality. In case of a power outage or other emergency, it can output power using AA batteries throughout the house. It can power smartphones using both rechargeable batteries and regular batteries. It can also be used as an LED light in emergencies. Number of batteries that can be charged: Up to 4 batteries in total (1-4 AA batteries and 1-4 AAA batteries) can be charged (compatible with rechargeable Evolta and Eneloop batteries). Do not attempt to charge batteries other than our nickel-metal hydride batteries. Doing so may cause battery leakage, overheating, rupture, or fire.