The high-capacity Opteka NB-10L rechargeable lithium-ion 1800mAh battery is a replacement for Canon NB-10L Battery. It features lithium technology, which ensures maximum battery life and maximum power. It also features no memory effect that lets you recharge partially drained batteries without reducing performance. Beware of low quality knockoffs on eBay, they can often damage your camera. Opteka Batteries are always guaranteed. Opteka batteries supply up to 25% more shots on average than the original! Works for the following: Canon Powershot SX40 HS & G1 X