Electronic shifting systems need their batteries mounted somewhere secure, and the S5's aero seatpost doesn't leave room for the standard seatpost-mounted cylinder battery that works in round tubes. The Cervelo Internal Battery Mount for S5 solves this by positioning the battery inside the downtube, using mounting bosses that Cervelo built into the frame specifically for this purpose. The composite bracket holds cylindrical batteries from Shimano Di2 or Campagnolo EPS systems, keeping the battery protected and the frame's aerodynamic profile uncompromised.

Installation routes through the bottom bracket area. You remove the bottom bracket cable guide to access the downtube interior, connect the battery wire to your shifting system and test everything before final installation, then secure the battery to the mount with zip ties. The whole assembly slides into the downtube, and two bolts through the external mounting bosses hold everything in place. Testing before you button things up matters here because the battery location isn't easily accessible once installed—you don't want to discover a wiring issue after the bottom bracket goes back in.

The mount fits 2014 and newer S5 framesets. If you're building up an S5 frame with electronic shifting or converting a mechanical build to Di2 or EPS, this bracket is the OEM solution for battery placement. The composite construction keeps weight minimal while providing a secure cradle that prevents the battery from rattling around inside the frame. Cervelo designed the internal cavity and mounting points as an integrated system, so the fit is precise rather than an aftermarket approximation.... Read More