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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.
@gmurphy
For a bit of a late follow-up here, I've been looking for similar, and have been using the Panasonic ML-920S/DN - it's an 11Mah 9mm x 2mm coin cell that can be recharged by feeding it 3V. I'm still in the midst of testing it, but for my purposes (a day of intermittently clicking buttons on the MDBT42) it so-far seems to work OK, though I'm still messing around with TX power to avoid big peak draw.
You can see it on the bottom of the board in the attached photo.
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