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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 watch itself shows a charge indicator when you charge it and it's on, however when it's powered off (black screen) as you're seeing, there is no indication for whether it's charging or not.
If the battery is flat as it looks like it is, you may need to leave it for 1-2 hours of constant charging before you turn it on - have you tried that yet, or have you only given it quite short periods of charging so far?