Running RPZ on a battery
For prototyping, using a regular AC power source or desktop computer is the way to go. Once you've come up with some ideas for projects, perhaps outdoor temperature monitors or humidity sensors in your attic, you might find that there isn't AC power available.
Now that you know how to run your Raspberry Pi Zero wirelessly, with a battery source, you could run it as a low-profile, remote system. There are dozens of different things you can do with a wireless, battery-powered computer and a few sensors-your only limitation is how long your batteries can run.
Depending on how simple, long-lasting, or low-profile your solution is, there are a few different options.
USB battery pack
USB battery packs have become common, ...