dl324 wrote: ↑
Wed May 22, 2019 2:23 am
If you unplug power from the power bank while the Pi is running, does it reboot?
I wanted to use a small power bank as a UPS to be able to move a Pi around, but when I disconnect power, the Pi reboots.
That's because of the switch speed of the regulator in the 5v step up module inside the powerbank - it doesn't switch fast enough, resulting in voltage drop to the point the Pi reboots. It could also be because of the sudden high load on the regulator causing transient voltage spikes and inrush current, again, causing a reboot.
Or it could just be that your USB cable is of poor quality.
Or perhaps the powerbank isn't designed to allow simultaneous charge and discharge.
Or even a combination of these things.