Originally Posted by wgscott

Their answer to your question #2 appears to be a reading comprehension failure.

I clicked the thread because I (more accurately my kid) has a Canyon Mtn bike, but I have a (non-Canyon) road bike with a Di2 battery in the seat post. It is FSA, but pretty much any non-suspension/non-dropper post should enable you to put a Di2 battery within it.

The answer they provide seems to assume you want to put it in their leaf spring seatpost, which you probably cannot.