Closed: Sun, Mon, Tues 10-6, Wed 10-6, Thurs 10-6, Fri 10-6, Sat 10-5
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.