Fosmon 3.7V 1400 mAh Extended Replacement Battery Pack for Canon NB-4L and Canon Digital Cameras Fosmon for Canon NB-4L replacement battery for compatible Canon Digital Cameras - Compatible Models Listed below in Product Description Never run out of battery power when you're about to capture the perfect moment. High capacity 1400 mAh / 3.7 V Rechargeable battery with premium cell technology. Integrated microchip prevents overcharging & lengthens battery life Fosmon Retail Packaging