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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.
@user158424
Was about to make my own post about this since I'm also having similar battery issues (Got mine yesterday from Adafruit, came with same firmware version), but I'm using watchfaces from the app loader (Pebble++ with a Calendar ClockInfo) with iOS integration installed alongside it, nothing else besides the preinstalled apps and an Info app that tells me stuff like battery percentage and if any sensors are on (I made sure stuff like HRM/GPS/Compass was disabled). Already tried leaving it charged overnight and calibrating the battery, but found that after only being unplugged for 3 hours it dropped to 50% while idle and connected to my phone. Also I only have Wake on button enabled and my brightness was set to something below or at 0.5.
Let me know if updating the firmware helps since that's the only thing I haven't tried yet, I just factory reset it and only installed the battery widget that shows percentages and iOS integration.