Shimano BT-DN320 Di2 XT/XTR Battery

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What Our Gearhead® Experts Are Saying: "I just started running the BT-DN300 in my new Di2 setup, and the clean look is a major win. It fits perfectly inside the seatpost, and the extra SD300 port gives me the wired backup I want for longer endurance rides."When we want our Di2 system to be sleek, reliable, and ready for the road ahead, we install the Shimano BT-DN300. Designed to mount internally inside a seatpost or frame, this compact battery delivers steady power to front and rear derailleurs with a minimalist footprint.

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