Abstract: A removable and replaceable battery pack includes a plurality of battery cells, an outer housing configured to encase the plurality of battery cells, a handle extending from the outer housing configured to be grasped by a user, an electrical connector located on a rear side of the outer housing, and a plurality of MOSFETs configured to control a current output to the electrical connector. The electrical connector includes a plurality of ports and is configured to electrically couple to a battery receptacle connector. Each of the plurality of MOSFETs is thermally coupled to the outer housing.

Abstract: A game footbag has a tough, flexible cover partly filled with predominantly parallel small discs to form a thick disc or flattened sphere to be kicked vertically repeatedly to keep it in the air as long as possible.