Trek's Removable Integrated Battery System (RIB) looks good and is user-friendly: the battery is completely integrated into the frame, thus well-protected, easily removable without tools, and provides space for a bottle cage.;This bike expands horizons: the top-notch Bosch system is suitable for daily commuting, leisurely rides, and lots 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 in the frame or when removed;