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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.
@AkosLukacs
Looks like the discharge percent calculation in Bangle's firmware is linear, but a Li battery's discharge curve is not linear.
And coincides somewhat with your finding: Here (scroll to fig2 the state-of-charge - voltage graph looks close to linear until ~20%, and drops quickly.