3T's Battery Holder holds a Shimano Di2 seat tube battery(Shimano SM-BTR2) inside your seat post, enabling easy fitting and removal of the battery. It is compatible only with 31.6 diameter seatposts.
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100-400 Brooksbank Ave. North Vancouver, BC V7J 2C2
Phone: (604) 986-5534 Fax: 604.986.5967