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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.
@Fteacher
@RomanistHere , I use a Oh1+ from polar, the bthrm app mentionned above and the run app. The gps recorder is set on 1 sec and I also record bthrm. My longest run was 1h20 and I still had battery left. I suspect it can take almost 3 hours with these settings, so there's definitively something wrong with your watch.