• You could have an external battery mounted underneath the saddle, like some of the pro teams have on their TT bikes. Not entirely sure how you'd get the cable out - presumably out of the top of the seat post.

  • Not if it's an external battery and you use an external battery mount. Like this, f'rexample:

  • I ran a Di2 battery in a Conti saddle pack with a hole poked in it for a year or so until @chak gifted me a proper battery mount from the Evans spare parts bin.

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