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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.
@DrAzzy
The espruino doesn't come with a battery, unless you bought the ultimate kit that came with one, though if you're driving a non-backlit LCD, the battery life will probably be decent. Espruino can run in very low power sleep mode if you tell it to.
I think the Espruino would make for a rather bulky wristwatch, especially if you wanted to add anything beyond a screen (and with just a screen, it doesn't seem very useful...)