• So yours has 5 pins, and you're not connecting to out?

    One thing it could be is the Pico has slightly different names for power signals than the original Espruino board, which is a bit confusing. You need to connect to the pin marked 'VCC' on the board (the one labelled 5V on the reference card and here). Bat itself is an input for a battery, rather than an output.

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