Shimano BT-DN320A Battery - On Component Type 1st Group

Full wireless technology means an all-new Battery. The BT-DN320 fits snuggly and protected within the new Wireless XT and XTR Rear Derailleur and powers the fast and smooth shifting.Protected Battery is tucked safely inside an enclosed space so the battery won't budge even in rough terrain while remaining completely removable for charging310 MaH provides for more riding on one chargeCharger sold separately