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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.
@stozk
The strange thing is that the heltec module (the one OP uses) works on my Arduino UNO on 5V and 3,3V. I also thought it was dead but then I tried it on the Arduino. So the voltage from the Bat pin on the Espruino should be more than enough.
The Crius C0-16, which is also being used on the tutorial/module site here works with the Espruino as inteded.
It's really strange.