Shimano BT-DN110 Di2 Battery

88.20
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          Description
          The rechargeable lithium-ion battery BT-DN110 is mounted internally in the frame or seat post for a clean look. Charging is easy with the BT-DN110 battery charger that connects via the SM-EW90 junction box, so you don't have to worry about removing your seatpost for charging. Requires BT-DN110 battery charger sold separately.
          • Di2 internal battery, fits all e-Tube Di2 groups.
          • Capacity: 500 mAH ( 2000km).
          • Use with EW-WU101 or SC-MT800 interfaces/junction to gain BlueTooth Smart wireless connectivity for on-the-fly