Abstract: Systems and methods of the various embodiments may provide a battery including a rolling diaphragm configured to move to accommodate an internal volume change of one or more components of the battery. Systems and methods of the various embodiments may provide a battery housing including a rolling diaphragm seal disposed between an interior volume of the battery and an electrode assembly within the battery. Various embodiments may provide an air electrode assembly including an air electrode supported on a buoyant platform such that the air electrode is above a surface of a volume of electrolyte when the buoyant platform is floating in the electrolyte.

Abstract: A golf club which comprises a shaft and an improved club head, the club head having a toe portion, a heel portion, a sole, a front face defined by a bottom edge adjacent the sole, a heel side edge and a toe side edge adjacent the heel and toe portions respectively, and a top edge, the front face having a recessed portion extending substantially between the heel side edge and the toe side edge. The recessed portion may have various configurations from concave to the combination of different planar surfaces.