This is a description of a zero-emission, battery-powered 400Hz GPU for aircraft support in remote locations or hangars without fixed infrastructure. It offers various battery capacity options to suit different operational needs and can be recharged from standard 3-phase power sources. The unit can power an aircraft even while its own batteries are charging. It utilizes proven TLD iBS Lithium-Ion battery technology, with each 22kWh pack being suitable for multiple ground support applications. Notably, these battery packs are designed for reuse in other TLD equipment after their primary service life.