SHIMANO BT-DN320, Wireless Di2, Battery

Completely wireless technology means an all-new battery. The BT-DN320 fits perfectly, securely protected inside the new wireless XTR rear derailleur, powering the fast and smooth shifts XTR is known for.

Protected battery: The battery is safely tucked away in a protected area, ensuring it doesn't budge an inch even on rough terrain. At the same time, it can be completely removed for charging.

Long range: 305 mAh delivers more riding per charge.