NOVELTY - The female electrical connector (200A) has a female housing (201) of insulating material having receptacles (205A,205B) for power terminals (204A,204B) and receptacles (214A,214B) for balancing terminals. A female extended portion (202B) partially forming a plug spans along part of the length of the female housing and is received in a male electrical connector. The receptacles also receive partly the male power and balancing terminals of the male connector such that male and female terminals establish electrical connection. The extended portion forms grooves.    USE - Female electrical connector for rechargeable battery, particularly a nickel metal hydride battery or lithium polymer battery associated with an electrically powered device such as electronic speed controller.    ADVANTAGE - Unsupported electrical connections between a battery and a charging or discharging device, such as a reverse polarity connection, connection between a battery of an incompatible chemistry type with a charging or discharging device, and/or connection of a battery of an incompatible capacity with a charging or discharging device may be prevented through implementation of one or more keying features within the housings of the connector. Improper charging or discharging operation of the battery may be prevented since information stored within the radio frequency identification (RFID) tag of the battery may be communicated to the electrically powered device at any time that an electrical connection for charging or discharging the battery is made.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a male electrical connector of a rechargeable battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the exploded view of a female electrical connector.    Female electrical connector (200A)    Female housing (201)    Female extended portion (202B)    Power terminals (204A,204B)    Receptacles for power terminals (205A,205B)    Receptacles for balancing terminals (214A,214B)