Opteka NB-10L 1800mAh Ultra High Capacity Li-ion Battery Pack for Canon PowerShot SX50HS SX40HS SX50 SX40 HS G16 G15 G1X G1 X Digital Camera Ultra high power 1800mAh Opteka batteries supply up to 25% more shots on average than the original! Memory free for maximum performance Lithium Ion 7.4v 2 Year Performance Guarantee