The Rugged, Full-Shift Power Source. Get the most out of your equipment with the HAWKER® flooded lead-acid POWERLINE® battery series. Whether you’re operating sit-down rider forklifts, walkies, or narrow-aisle lift trucks, POWERLINE® forklift battery will keep you up and running.The foundation of the superior performance and long-life cycle of a POWERLINE® forklift battery is based on the battery’s design and construction.