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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
The bootloader has very little space left inside it (it's 4k smaller than it's supposed to be and it has to handle the LCD too) so it's hard to do anything too serious. Just checking battery charge may be a step too far.
However, it's possible that I could just make the bootloader put the watch to sleep unless BTN1 is pressed (since that's the button that's used to turn the device on).
Again, this may not be needed. I haven't had any dead units here, so really it depends whether any of the beta units suffer issues.