A battery pack charger system includes one or more charging ports for charging one or more removable battery packs. Each of the one or more charging ports may receive a plurality of different removable battery packs for charging. Each of the one or more charging ports may to receive at least a first battery pack having a first external physical interface and a second battery pack having a second external physical interface. Each of the one or more charging ports may include a first feature that secures, or retains, or locks the first battery pack in the charging port, and a second feature that secures, or retains, or locks the second battery pack in the charging port.