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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
Yes, that's about it. However if the CR2025s go below 4.7v then when you plug in USB it'll try and charge them, which probably isn't good.
If you added a schottky diode (so you only get a 0.3v voltage drop) between the battery and 'Bat' it'd be totally safe though.
One other thing - if you're doing this for yourself then you might be able to modify a JST battery connector so the wires came out of the top, allowing you to fit it even when the Espruino was in a box. It'd be tight though.