[Bangle.js 2] modification: add buzzer, bigger battery, more switches, minus HRM

I'm thinking to discharge it again and leave it for longer period of time, say a couple of days over the weekend.

since you have made a new case, don't you have access to the battery terminals? You can short them for half a second, the BMS on the battery will turn off, and turn on again once you plug in the charger.