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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@dandelany
Unfortunately it looks like the adapter from that link is out of stock and may no longer be available... However, I did see this (even better IMO) one on Tindie:
https://www.tindie.com/products/bobricius/coin-cell-battery-emulator-cr2016cr2032/
Powered by microUSB w/ 3V regulator & it even has handy contacts to hook up an ammeter. The same seller has a number of other cool gadgets in their Tindie store...