Whether it's just having a second battery for peace of mind, or for carrying on a ride you know is going to require a bit more juice, this Specialized Turbo SC battery has long lifecycle for that extra distance. It charges super fast and has a massive 691Wh capacity. Specialized Turbo SC Battery Features  Custom Li-Ion battery for Turbo. 691Wh capacity (60 cells x 3.2Ah) with ANT/BT module to connect to external devices. Allows superfast charging times and a long lifecycle. SC battery is compatible with the Turbo Mission Control app, available in iTunes® and Google Play® app stores.