I want to create a device with only 1 plug in (usb-c in nano) and I want to charge a battery with the nano power and use the same battery to power the nano once it's disconnected from power. I know that I could use a relay to stop the battery from outputting power if it has an input voltage, but then the battery would never output a voltage to the arduino. Am I being stupid? I've drawn a (very) rough sketch of my idea. Could I use a relay each on both input and output? Is there any way my dumb idea is possible?
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