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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.
@HughB
There's a whole thread on this a while back, I'd have to look back to find it. About a month ago.
The battery usage as shown by % is not linear. The last 40% will shoot down in 1 day. The first 60% may take 3-20 days depending on what things you have configured.