Canon VIXIA HF M400 Camcorder Battery Lithium-Ion 2700mAh - Replacement for Canon BP-827 Battery Replacement battery for the Canon BP827, Lithium-Ion (Li-ion) 7.4V (2700mAh) This Synergy Digital battery is fully compatible with the original Canon BP827 Battery. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark