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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.
@Gordon
The problem is the NFC ring around the outside, but then also the room for the pivot point and the button :(
If you didn't care about that you could probably drill through the NFC ring and fit a bigger battery holder though.
Thing is, CR2032 are still almost certainly cheaper per Watt and easier to buy since they are produced/sold in higher numbers. I was considering adding a bigger battery but in the UK at least you can buy CR2032 from many shops on the high street. Good luck finding a CR2477 anywhere offline :)