SDBP809 Rechargeable Lithium-Ion Battery - Ultra High Capacity (900mAh 7.4V) - Replacement For The Canon BP-809 Battery Replacement battery for the Canon BP809, Lithium-Ion (Li-ion) 7.4V (900mAh) This Synergy Digital battery is fully compatible with the original Canon BP809 Battery. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark