Could you get an external battery to play with? I've seen some installations with it under the saddle.
You can mount the internal battery externally so you don't need the external battery. Like I said, I bought extra cables for mine to just dangle it in the framebag until I came up with a more permanent solution.
It was more that it's a bit more compact rather than you can't do the internal on the outside if you get what I mean.
@hippy started
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Could you get an external battery to play with? I've seen some installations with it under the saddle.