Acroprint ES900 Full Power Reserve Battery (Non-Atomic)Default ManufacturerAcroprint ES900 Full Operational Ni-Cd Battery for punching when the power is off, up to 200 punches. For Non-AtomicOffice Suppliesacroprint_es900_full_power_reserve58-0108-00159.00Time Clock Expresshttps://www.timeclockexpress.com/Item/acroprint_es900_full_power_reserve