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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.
@AntiCat
I'm not an expert but likely you will hit in cold temperatures the limitation of the CR2032 cell or almost any other battery first. The chemical process within a battery is significantly more temperature dependent as any other component.
Next to the battery your only other concern should be condensation since it may lead to shorts or corrosion.