Canon Battery BP945 Li-Ion 4450mAh, 4500 mAh, 7.2 V, Lithium-Ion (Li-Ion) Canon Battery BP945 Li-Ion 4450mAh. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 4500 mAh, Battery voltage: 7.2 V. Weight: 10.1 oz (285 g)