Shimano BT-DN320 Battery DI2 Internal Type

Shimano BT-DN320 Di2 Battery Internal
Full wireless technology means an all-new Battery. The BT-DN320 fits snuggly and protected within the new Wireless XTR Rear Derailleur and powers the fast and smooth shifting XTR is known for.
Features:
- Protected Battery
- Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining completely removable for charging.
- Longevity
- 310 MaH provides for more riding on one charge.