I would like to create a BLE device which uses Espruino and is powered by a solar panel or cell. It should be as small as possible, not larger than a Puck.js.
Is it possible for a Puck.js or MDBT42Q Breakout Board? What components do you recommend? It should have endless battery lifetime if possible. The board Just advertises and listens for a button, so the power consumption is quite low.