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@Dammit
There is an existing, quite large hole in the BB shell into which the cable guide used to affix.
The cable will enter there, go round the axle, up the seat tube and plug into the new battery pack which will be in the seatpost.
Battery pack is made up of two Trustfire 900mAH batteries soldered into slim pack, Trustfire batteries chosen as they have integral protection PCBs.