Bosch PowerTube batteries. Like all Bosch PowerTubes, the battery is perfectly integrated into the frame of the eBike. The smart battery management system reliably protects the battery cells from overload. There is an intuitive, lockable mechanism, making the battery particularly easy and convenient to use. Lithium-ion battery is equipped with a battery management system that protects the battery cells from overload The battery is always securely fastened in the frame, and removal is via an intuitive, lockable mechanism that offers user-friendly operation Charge time approx 6 hours for full capacity The smart system compatible Horizontal/Vertical mount is determined by the bike frame and refers to the battery postion 36V, 20.1 Amp Hours. Approx 750 watts. Please note: the smart system is not compatible with the Bosch eBike System 2