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@Brommers
Right, the battery needs to go in the seat tube. The battery is round, the seat tube has an aero section. Also, I want to fit the Di2 ANT+ sender in the seat tube. Shimano suggest putting it on the chainstay, right by the rear mech, but that looks awful, and I have it on good authority that it'll work inside a carbon frame tube. So, I need a way to fit the battery and the Di2 ANT+ sender in the seat tube in a way which means they're firmly in place and won't rattle around, while at the same time giving myself some way of hoiking them both out if I ever feel the need.
This is what I've come up with.
The loop at the top is just a bit of old gear cable, and the black blobby bits are Sugru. Fantastic stuff, can't believe I've never bought any before. Although you can't see from the photo, the Sugru bits are the same shape as the inside of the seatpost (roughly) so it's a pretty snug fit. I'm going to wrap a thin layer of foam around the Di2 sender just to make sure it doesn't rattle.
Preliminary indications are that it fits, it doesn't rattle, and the Di2 ANT+ sender appears to be happy talking to an Edge 1000. Happy days.