Apply two more small dollops of adhesive, this time on either side of the JST battery connector, and stick the fabric down taught across the leather band.
Clamp with more binder clips and allow to dry for 24 hours.
Less glue is more! Check to make sure there's no adhesive touching the leather band. Your circuit should slide along the band freely so you can adjust it, so here's a place where being tidy really yields the best result!