Amazon.com : Canon Cameras NB-5L Battery Pack 1135B001 : Digital Camera Batteries : Electronics
Kastar NB-5L Battery (2-Pack) for Canon PowerShot S100, S110, SD700, SD790, SD800, SD850, SD870 is, SD880 is, SD890 is, SD900 is, SD950 is, SD970 is, SD990 is, SX200 is, SX210 is, SX220