Replacement 2-Pack non-OEM (generic) Lithium-ion battery for CANON NB-1LH camera batteries; great as a back up power source for your digital shooting needs Absolutely no memory effect so that you can charge battery at anytime Absolutely no memory effect so that you can charge battery at anytime Integrated microchip prevents overcharging and lengthens battery life Capacity at 3.7V 900 mAh (will not affect battery compatibility) Please charger your Batteries for at least 12 hours before first use for optimal performance