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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.
@johan_m_o
The watch did start off at 100% and I ran the code immediately after taking the watch off the charger. And looking at your graph, the battery percentage you've recorded pretty much exactly matches what I saw (with the plateau at 9-ish percent and then another plateau at 0).
That blue line looks spot on though, so perhaps this is something we'll have to live with.