Audio Video Photo Light since 2000
BP-955 - Lithium-Ion Battery Pack (5200mAh) For Canon C300, XF100/105, XF300/305
Designed for use with the Canon XF series of professional camcorders.
The BP-955 sends remaining battery life and data back to the camcorder to prevent untimely power loss.
The four LED lamps on the battery also let you view remaining battery life.