Comments about Canon Canon BP-945 Lithium Ion Battery Pack:

An extra battery is a must if you’re going to be away from an electrical outlet for more than an hour with the camera in constant use. While this battery will only last about 90 minutes with constant shooting, it is the only auxiliary battery offered by Cannon for the XL2. With careful use of the camera’s off/on controls, the standard battery and this auxiliary battery should last an entire day of hiking until you can get back to civilization to recharge the batteries. Recharging times are average for auxiliary camcorder batteries.