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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.
@Gordon
Are you sure it's not just a dead battery? I know you said you replaced them but occasionally you do get bad ones. You could check
Puck.getBatteryPercentage()when you are able to connect via the IDE.You can also try doing a full reset - hold the button down while flicking the coin cell so the green LED comes on, then keep holding through all 3 LEDs lighting, and the red LED blinking multiple times - then keep holding an extra second. Anything that was then saved to nonvolatile memory would be wiped out.