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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
Lithium Thionyl Chloride batteries are not lipo batteries. They use a different chemistry, and are not rechargable. They have (according to the manufacturers, so take w/salt) ~1% self discharge per year. They also don't handle high current very well (they're the batteries they use in, for example, those new 12-year disposable smoke detectors, that never need new batteries).
I doubt they'd actually be putting out 3.5v by the end, though they've got a pretty flat discharge curve, and I think they'd be close enough that it'd still work. The STM32F401CC is spec'ed to run at 1.8-3.6v, it looks like.
On another topic... shouldn't one of the kits include an esp8266? That'd be a great selling point, Wi-Fi connectivity included in the kit