CANON BATTERY PACK BP-820 Key Features Lithium-Ion Chemistry 7.4 VDC 1780mAh Capacity This Canon BP-820 Lithium-Ion Single Battery Pack uses lithium-ion chemistry and has a capacity of 1780mAh with a voltage of 7.4 VDC. This Canon BP-820 Lithium-Ion Single Battery Pack uses lithium-ion chemistry and has a capacity of 1780mAh with a voltage ...