• @Gordon, something like that:

    `
    VBat ---------------------------+----+-------­---+----
                    .-----------.   |    |          |
                    | 3..3.3V   |   |   .|.         |
    3..3.3V -+------+ Voltage   +---'   |R|         |
             |      | Regulator |       |E|         |
             |      '-----+-----'       |S|         |
             |            |             |1|         | +
    ESPRUINO |            |             '|'      _______
    iTracker |            |              |         ___
    .--------+--.         |              |       _______
    |           |         |              |   Bat   ___
    |           |         |              |       _______
    |    Analog |         |              |         ___
    |    read   +----+---------[RES3]----+       _______
    |    pin    |    |    |              |         ___
    |           |    |    |             .|.         | -
    |           |    |    |             |R|         |
    '-----+-----'  -----  |             |E|         |
          |        -----  |             |S|         |
          |          |    |             |2|         |
          |          |    |             '|'         |
          |          |    |              |          |
    GND --+----------+----+--------------+------­----+----
    `
    

    (Optional) RESistor3 helps smothing ripples and decouples the voltage divider even more.

    I had some concerns for the reliable switching of nMosFet as well, as you documented on https://www.espruino.com/mosfets and @DrAzzy points out in a post of this conversation about ...PICO ... and MOSFET.

    I will give the options some hands-on consideration - including component specifications- because I have something in (slow) work that uses 3.7 LiPo on solar cell with charge board and powers some sensors, LORA and PICO / Puck. For the nMosFet option I plan to use @DrAzzy's nMosFets - see conversation about Power Supply. I had them already successfully in use with a Espruino-Wifi and LED light panels... LED's feed by 5V and low-side switched.

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