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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.
Piers
Do you mean the Bangle.js 1? I only started shipping Bangle.js 2 out last December so it couldn't have had 2 years!
On Bangle.js 1 you can unscrew the back, and while you have to unsolder it, yes, you can replace the battery.
Honestly the cost of shipping it here, me doing it and shipping it back is going to be prohibitively high, but I believe I do still have some spare batteries I could ship out if you or someone you know is willing to do it.