I made trouties DIY 1800 lumen lights last year, and made a home made battery pack of 3 x 3 18650 batteries.
These used to fit nicely in to a battery case I had that fitted on the top tube. However my new bike will not take the pack on the top tube. So I need a:
Battery Pouch approx 90 x 62 x 40 cm that will fit to a 90mm oversized stem.
Any ideas?
Ta


