Treks Removable Integrated Battery System (RIB) looks great and is user-friendly: The battery is completely integrated into the frame, providing excellent protection, easy to remove without tools, and offers space for a bottle cage.; This bike expands horizons: The top-notch Bosch system is equally suitable for daily commuting, recreational rides, and plenty of fun on the trail; 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 while it is in the frame or removed.