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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
Ahh - I guess 3x slightly flat AAA batteries will come to 1v*3 = 3v. I guess you might have to use 4 in that case (if you're planning on powering the SD card off them).
If you do that, don't connect to the '3.3v' pin though. It's best to connect to the JST battery power connector (if you can, otherwise use pins marked 'Bat' - but using those will cause 4.7v to be put across the batteries if USB is connected, which isn't good news).
You'd need to do that so Espruino's voltage regulator can regulate it down to 3.3v.
While Espruino can take 2v to 4v on the 3.3v line, 4x charged AAAs would be too high. I also have no idea about the flash, but I assume that it is very picky about voltages, so you'll need to make sure that runs from the regulated 3.3v.