The used Canon BP-808 Replacement Lithium-Ion Battery is a rechargeable 890mAh, 7.4V battery.
It is compatible with the Canon FS10, FS11, FS20, FS21, FS22, FS31, FS40, FS100, FS200, FS300, FS400, HF S11 refurbished, HF21 refurbished, VIXIA HF G20, VIXIA HF G10, HF M30, HF M31, HF M32, HF M40, HF M41, HF M300, HF M301, HF M400, HF S10, HF S11, HF S20, HF S21, HF S30, HF S100, HF S200, HF11, HF20, HF200, HF21, HG20, HG21, and XA10 camcorders.