Digital Nc BATVIVNB-10L/SX40HS (AKA, Canon Nb-10L, 5668B001) Li-Ion 3.5 Hour Rechargeable Intelligent Battery for Select Canon Powershot Cameras Integrated microchip for communications with camera and charger Prevents overcharging, & lengthens battery life This battery lasts 3.5 hours This battery is made with the info chip, which shows remaining battery duration on Canon LCD