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@Robert
When I have no USB connection, but have 4 x AAA rechargeable batteries (~4.8V, ~600 mA) connected to GND and BAT_IN, will I see full power (voltage x current) at the VBAT pin or is there any drop in voltage or current between BAT_IN and VBAT?
I had a look at the power diagram at https://www.espruino.com/Pico and that assumes BAT_IN and VBAT are equivalent. However the board view in the forum comment https://forum.espruino.com/comments/12247605/ seems to indicate that there are devices between BAT_IN and VBAT.
Thanks for any answer or tips where I can look for info!