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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
NRF51822? Or you mean the blue/silver module - which is actually an MDBT42Q?
I'm afraid you can't do it directly no. The MDBT42Q breakout board has a voltage regulator that takes the ~4.2v from the lithium battery down to a 3.3v that the chip can manage. You could always add your own though