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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.
@allObjects
Did you already do a Hard Reset? - see http://www.espruino.com/Puck.js#i-saved-some-code-and-my-puck-js-no-longer-works, section Hard Reset.
...and - yeah - it helps having the battery's voltage measured by itself or when inserted - latter via pins of your headers.
(Notice the puck sitting on surface without case... depending what that surface is can have an impact... since you solder and do similar things, you are aware of possible issues, I assume).