I'm looking to run a 1x10 Di2 setup on my TT bike. I've purchased the Shimano rear der and front wiring harness, but would like to use custom bits for everything else.
Instead of putting the battery inside the seatpost, I've decided I'm going to try to put it inside one of the aero bar extensions. This would allow me to run one cable from the handlebar area all the way to the rear der. The extension has a 19mm id. Does anyone have any suggestions on a battery that would fit inside there?
Also, would any of the plugs on the front wiring harness fit into the rear der? I'm going to solder all my connection to this harness anyway. And if I can use one of those plugs to run into the rear der, that would save me some money. I would solder the plug onto the end of my one, long cable.