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Calfee Enve Seatpost with Di2 Battery  
Calfee, Enve and Shimano all combine together to make one of the coolest innovations in recent years. Once again Calfee brings to the game simple innovation that really works.
Lasts 20% longer and is 20g lighter than Shimano’s battery. A sleeve is glued into seatpost, then battery is held in with washers and C-clips. Wiring is run thru seat tube, you simply attach the wiring and install your seat post as normal.
System is retrofittable on any and all carbon fiber bikes
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