[alin23]

Any cheap powerbank will do. The Pi Zero W never uses more than 2A of current which is within a recent powerbank possibilities.

Something like this should be enough to keep it running for a few hours: https://www.amazon.com/Ultra-Slim-Ultra-Portable-Ultra-Safe-...

[BeatQuestGames]

Ahh, I'm using a power bank right now and it works well. It does bother me a bit the power bank is 3x the size of the zero itself, but it works