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.
@atz started
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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.