Trek's Removable Integrated Battery System (RIB) looks great and is user-friendly: the battery is fully integrated into the frame, well-protected, tool-free removable, and also provides space for a bottle cage. This bike expands horizons: the top-notch Bosch system is equally suitable for daily commuting, leisure rides, and having a lot of fun on the trails. The Purion controller features a Walk Assist function and an intelligent eMTB mode that automatically delivers the needed power depending on the terrain. Thanks to the external charging port, you can easily and conveniently charge the battery while it's in the frame or removed.