Sunpak TAI-S1228-50 3.7-Volt 760 mAh Lithium-Ion Battery Pack (Replaces Canon NB-4L) Rechargeable, long-lasting lithium-ion digital camera battery Generic replacement for the Canon NB-4L camera battery Long-lasting power rating of 3.7 volts and 760 mAH Memory-free technology lets you charge battery at any time Compatible with several Canon models, including PowerShot SD200 and SD300