Keep your compatible camcorder ready for use with this Canon BP-718 6055B002 lithium-ion battery that provides 3.6V and a 1840 mAh rating for efficient power on the go.
The battery is made by Canon and sold for almost $100 for a 1 inch by 1 inch battery; it does have circuits in it to communicate with the video camera it's charge status; whereas the other batters that fit do not communicate with the camera on charge status.
What's great about it: seems to power my video camera
What's not so great: It's priced 3X what it should be