NOVELTY - The apparatus has an anode electrically connected to a cathode. A top part of a rechargeable battery (100) is electrically connected to another cathode and to a bottom side of a top metal disk in a top portion of a body portion. A top side of the top metal disk is electrically connected to the bottom side of the top metal disk. A vent/fill hole (127) is defined in a side of a body (125) adjacent to a top part of the body portion. An electrolyte e.g. sodium citrate, partially fills the body portion, and is in contact with the cathodes and the anode and another anode.    USE - Self-recharging battery apparatus e.g. fully assembled D-sized battery apparatus and AA-battery apparatus, for personal electronics e.g. cameras and cell phones, motorcycles, automotive, deep cycle marines, robots, power watercrafts, sail watercrafts, maritime equipment e.g. life jacket lights, marker buoy lights, navigation lights and life raft lights, camping devices, hunting devices, fishing devices, kayaking devices, boating devices, skiing devices, hiking devices, biking devices, sailing devices, remote cabins, emergency and disaster response applications and survival equipment. Can also be used as a non-electric or green-powered battery apparatus, saltwater-powered battery apparatus, AAA-sized rechargeable battery apparatus, C-sized rechargeable battery apparatus, 6-volt rechargeable battery apparatus and a 9-volt rechargeable battery apparatus.    ADVANTAGE - The vent/fill hole is defined within the side and located adjacent a top end of the recharging battery, and permits introduction of saline or other electrolytic solution into an interior of the recharging battery and escaping of excess gas contained or produced within the recharging battery, while preventing escape of saline/electrolyte. The apparatus allows a sleeve to form a watertight seal around the rechargeable battery and top and bottom metal plates so as to prevent or minimize corrosion of metal by the electrolyte solution and other moisture. The vent/fill hole is positioned in an offset manner so as to mate correct orientation of an anode-cathode component with holes.    DETAILED DESCRIPTION - The cathodes include carbon fiber fabric with a wire mesh backing.    DESCRIPTION OF DRAWING(S) - The drawing shows a side perspective view of a self-recharging battery.    Rechargeable battery (100)    Top end of battery (110)    Longitudinal opening (120)    Body (125)    Vent/fill hole (127)