The Canon BP-828 is a high-capacity lithium-ion battery pack for Canon professional camcorders, including the XF405 and XF400 and select XA-series and LEGRIA HF models. It delivers 2,670mAh at 7.4V, and being lithium-ion it can be charged or discharged at any time without developing a memory effect. Check the BP-828 against your specific camcorder before ordering.