I'm trying to power my Pi 3 with 8x AA batteries wired to a 5V voltage regulator. I measured a voltage of 5.4V. I'm using the IO pins instead of the microUSB port.
The Pi powers on but doesn't work. The red led starts blinking. When I connect a monitor I see that it's stuck in a boot loop.
Shouldn't it be possible to power a Pi like this? Am I doomed to buy a proper battery?