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I've run a pi 3 on a generic iPhone battery brick. Just needs to have 5v USB output. The pi zero needs 3.3v, so 5v might fry it.

The Pi Zero (and the new Pi Zero W) also takes standard USB 5v, not 3.3v.

No idea where you got the "needs 3.3v" from, but no, it runs off 5V the same as the Pi 3.

Yes I was wrong.