Arduino Nano Compact Power Supply

Using Arduino General Electronics
#1

What would be the most appropriate & compact power source for Arduino Nano + one SG-90 servo + few sensors?
I’ve came up with standard 9V PP3 battery connected to pin 30 (unregulated power supply pin)

Would this be enough for one low-power servo as SG-90 powered directly by board? Are there better options?

#2

How long do you want power?

#3

If it works for 30 minutes with one charge it’s ok. (I guess there are 9v pp3 accumulators?)

#4