ENVE Di2 Battery Retention Seatpost Plug – 27.2

##ENVE Di2 Battery Retention Seatpost Plug – 27.2 The ENVE Di2 Battery Retention Seat Post Plug fits into the bottom of 27.2mm ENVE carbon seatposts; gripping both the post and the battery securely; and stops the Shimano Di2 battery from dropping out or moving around. It allows a seatpost mounted battery to be used with an Enve seatpost instead of an external frame mounted battery; keeping the battery out of harm?s way and cleaning up the frame.