Canon's BP-820 is a high capacity lithium ion battery for all Canon HF series camcorders.
The BP820 can be charged or discharged at any time without developing memory effects, meaning it will never lose its ability to hold a full charge. It has a voltage of 7.4V and a capacity of 1780mAh.
Keep shooting on-the-move with this spare Canon BP-820 Lithium-ion Battery. With lithium technology, this powerful, rechargeable battery ensures you get the most of your camera with a single full charge and does not suffer from a memory effect if you top up the charge before its fully drained. Use this additional battery as a spare for your kit, or as a replacement for your compatible camcorder battery.