Thinking error.
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Deleted user commented
The "higher-on-demand.png" is wrong.
When the mosfet is 'off', and battery voltage is higher than "MCU VCC +0.5volt", current will still flow through R1 and the pin protection diode of the MCU to VCC of the MCU.
rlogiacco commented
You are totally right, I should have used a p-channel mosfet! Well spotted!
rlogiacco commented
I've fixed the README diagram, I will remove the png files: thanks!