Canon NB-4L/NB4L 1200 mAh Lithium Ion Battery Pack for the SD400, SD630, SD600, SD750, SD1000 & TX1 Digital Cameras Sterlingtek POWWER Premium Replacement Battery Our Canon NB-4L battery equivalent is a high performance Lithium Ion battery with no memory effect. And allows a longer run time than the Canon original battery. Sterlingtek NB-4L: 1200mAh 3.7V Ultra high power capacity for powerful image taking. Did You Know? The mAh rating of a battery indicates how "big the gas tank" of a battery is. The higher the mAh rating is the more power that a battery will store & last longer.