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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.
@allObjects
@Narvey, you're absolutely correct... (and @Gordon was just a bit too nice not to point this out). Battery on BAT_IN in goes thru the MOSFET Q1 which allows a co-powering and even charges the battery (with closed P$1/P$2 solder bridge as described in schema) by pin B0. The other - very noteworthy - application of the MOSFET Q1 is driving a load connected to BAT_IN and Pico power is supplied thru USB or Bat_out.