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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.
user107550
Watch batteries have no hope of powering the cellular module. You need to use Lithium Ion batteries. Unfortunately the RAK8212 has a poor voltage regulator that draws more current than the cellular module in sleep, so this module is a poor choice for something that has to run for a long time.
As for waterproof cases, there's many suppliers of IP rated enclosures.