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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
In fact to make it easier, you could go to this page
Say you take a capacitor of a known size, charge it up to 5v, then time how long it takes to discharge to 4v. You'll get a
mAhfigure from that website, so then you're just dividing it by how many hours it took to discharge (I think?).