It comes with a tiny battery that last just over an hour. I recommend you buy a pair of Wasabi high capacity spares for $45. They last several hours each and are much cheaper and better than the Canon brand batteries.
Yes it comes with a batterie « BP-808 » and a adaptor « CA-570 » This batterie work around an hour and half. If you need more you can buy the charger CG-800 with the BP-819 good for 260 min. or with the battrie BP-827 who is good for 385 min. It's depend what you need.