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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
Yes, ad @Purple-Tentacle says it's fine.
The only gotcha is the battery is soldered to the main watch PCB with reasonably small wires, but if you have a fine-ish soldering iron you should be fine.
If that turns out to be the issue then I can actually just send you a replacement battery and there's nothing to send back.