SDCGADU21 Lithium-Ion Battery - Rechargeable Ultra High Capacity (7.4V 2200 mAh) - Replacement for Panasonic CGA-DU21U Battery Replacement battery for the Panasonic CGA-DU21, Lithium-Ion (Li-ion) 7.4V (2200mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark