Shimano BT-DN320 Rear Derailleur Battery

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BT-DN320 Rear Derailleur Battery Description: This Shimano BT-DN320 Rear Derailleur Battery is intended for use with Shimano Di2 rear derailleurs, powering smooth shifting on longer rides with a single charge. Features: Replacement system battery for Shimano Derailleurs Protected design remains safely housed when installed 310 MaH battery capacity provides more riding per charge Specifications: Compatible: Shimano Di2 Derailleurs, EC-EN100 chargers