NOVELTY - The battery system (10) has a metal-air battery which includes the zinc-air cells within a housing (12). The housing has an opening which permits an influx of air from a surrounding ambient into an interior of the battery for exposure to the cells. The battery has a cover that can be entirely or partially moved relative to an air hole (18) for selectively controlling the exposure of the opening to the ambient when it is desired to generate energy for discharge to the rechargeable electronic device.    USE - Battery system for providing energy to electronic devices having rechargeable power source. Uses include but are not limited to cell phone, smart phone, computer, flashlights and vehicles.    ADVANTAGE - Reduces impact on environment, improves balance of weight, strength and durability since the housing is made of recyclable acrylonitrile butadiene styrene. Enhances the stability and performance of the catalyst since the nano-catalyst comprises an external layer of oxide of the metal with a metal core. Creates different visual impressions as indicia of battery mode of operation due to the variety of cover hole and air hole configurations and shapes. Increase the potential power output by orienting the air hole side of battery cells toward the interior space to permits the cell sets to be joined together to form a portable monolithic arrangement wired in parallel or in series. Enables easy transport within housing, and replacement with substitute monolith of either the same or different arrangement for attachment to the transformer or fans by reducing the size of the monolith battery. Enables quick recharge of power for external device using residual air within the housing with minimal exposure of the battery to the air or preserve the power for later discharge since the lid can be set to sealably expose the outlets of the transformer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of the battery system.    Battery system (10)    Housing (12)    First face (14)    Second face (16)    Air hole (18)