While encasing the ring in resin is optional, you will need to insulate the exposed components in e6000 or hot glue to avoid damaging the delicate solder joints.
I started testing by filling my molds with hot glue before putting a few components into the molds and testing resin. Hot glue rings could work in a pinch, but were more sticky and yellow than I wanted.
Insulate battery terminals and solder joints on Gemma M0 with e6000 or your other favorite adhesive.
Attach a battery to the Gemma M0 and then both to the bracelet using e6000 or foam adhesive. I carefully wrapped the wires around the battery so that I could still remove it for charging.
