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 e

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-External-Lightning/dp/B00Z24G06M/ https://www.amazon.com/Ultra-Slim-Ultra-Portable-Ultra-Safe-...