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There are such things as adjustable bottle cages. E.g. https://www.halfords.com/cycling/bike-accessories/bike-bottle-cages/elite-pria-pave-adjustable-bike-bottle-cage-261573.html
This is surprisingly very big, too big diameter. The elite one is SO NEARLY good but the battery won’t fit in.
Any other smart ideas please?
Apparently a bidon has a 74mm diameter.