Opteka NB-4L 1800mAh Ultra High Capacity Li-ion Battery Pack for Canon PowerShot SD1100 IS, SD1000, SD960 IS, SD780 IS, SD750, SD630, SD600, SD450, SD430, SD400, SD300, SD200, SD40, SD30, TX1 Ultra high power 1800mAh Opteka batteries supply up to 25% more shots on average than the original! Memory free for maximum performance Lithium Ion 3.7v 2 Year Performance Guarantee