The theoretical energy density of a rechargeable Zinc-air battery is typically estimated to be around 1086 Wh/kg (watt-hours per kilogram). This value represents the maximum amount of energy that can be stored in the battery per unit of weight under ideal conditions. However, it's important to note that achieving this theoretical energy density in practical applications is challenging due to various factors such as battery design, materials, efficiency, and system limitations. Real-world energy densities achieved in commercial zinc-air batteries are typically lower than the theoretical limit but still offer substantial energy storage capabilities. Ongoing research and development efforts aim to improve the energy density and overall performance of Zinc-air batteries.