Treks Removable Integrated Battery System (RIB) looks great and is user-friendly: The battery is completely integrated into the frame, providing excellent protection, easy tool-free removal, and space for a bottle cage.;This bike expands horizons: the high-quality Bosch system is equally suitable for daily commuting, leisurely rides, and plenty of fun on the trails;The Purion controller features a Walk Assist function and an intelligent eMTB mode that automatically delivers the required power depending on the terrain;Thanks to the external charging port, you can easily and conveniently charge the battery in the frame or when removed;