A battery assembly is provided for electrical concatenation in series. The battery assembly includes a plurality of battery packs; a switch; a receiver; and an actuator. Each battery pack includes a plurality of rechargeable battery cells electrically connected in series. The switch electrically connects and disconnects first and second battery packs together. The receiver transmits power from the switch. The actuator operates the switch to connect and disconnect the battery packs. In preferred embodiments, the switch includes first and second buses and a deflector. The first bus electrically contacts the first battery pack. The second bus electrically contacts the second battery pack. The deflector moves the first bus electrically connect and disconnect with the second bus in response to communication with the actuator. An electrical connector is further provided for mechanical engagement and disengagement of electrical conduction to a terminal. The connector includes a block and a plurality of contacts. The block includes a plurality of openings. Each contact is disposed into a corresponding opening in the block.