Treks Removable Integrated Battery System (RIB) looks good and is user-friendly: The battery is fully integrated into the frame, providing excellent protection, and can be easily removed without tools to make room for a water bottle holder.; This bike expands horizons: The premium Bosch system is equally suitable for daily commuting, leisurely 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; With the external charging port, you can easily and conveniently charge the battery while it is in the frame or removed.