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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
Ok, thanks - so this looks like a hardware issue then - I doubt there is anything that stops the watch being useful, but it seems that there may not be a connection from the battery to the pin D3 that measures the voltage :(
On nRF52 the small negative values are usually what happens when the pin is connected to GND outside the microcontroller.
Not quire sure what you want to do - we're very low on watches so would have to send out a replacement in the new year, or I could give you a discount?