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@Gordon
Yes. If you connect the battery to BAT_IN, that voltage appears on
VBAT. However, on3.3v(the pin next to it) you'll get 3.3v OR 0.3v less than VBAT, whichever is smaller - because the voltage regulator always drops a little bit of voltage.I'd definitely suggest a P channel MOSFET. Things get tricky when you have voltages above 3.3v (because the Pico's outputs only do 3.3v), but because you're running everything at 3.3v it's just a matter of connecting one between 3.3v, the Pico, and the display. Have you seen http://www.espruino.com/mosfets ?