• The Pico also has a VBAT pin which provides somewhere in the region of
    4.5v when from USB or battery voltage when powered from battery, so I would use that: https://www.espruino.com/Pico#pinout

    I'll try this tonight !

    There's even a self-resetting fuse in there so if you draw too much
    power (>500mA sustained) from USB it'll just temporarily cut out
    without breaking anything.

    didn't know that, it's cool


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