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  • I would reconsider the uselessness of the battery support... (JST header and/or step-up/down)
    This is definitely the first feature I look at when I want to leave something running in the field.
    If no remaining place on the PCB, why not providing only 2 pads, BATTERY_IN and GND ?

    Just a tip for the reverse voltage protection, you can try this mosfet based solution, which requires only 1 componentĀ­/2013/02/pfet.png

    Could we imagine this board providing a mechanical hole, in order to ease the mounting ?

    Thank you @Gordon, for always trying to improve the Espruino and its user experience.