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This question already has an answer here:

What is the minimum power supply needed for PiZero? I want to know the numbers in terms of Voltage and amperes. I want to build a cluster of Pis.

marked as duplicate by goldilocks Jan 20 '16 at 9:13

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The minimum is really small. A good quality phone charger may even serve the purpose.

https://raspberrypi.stackexchange.com/a/40393/24224

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    I was looking for that link as a dupe. Thanks for pointing to it! – Ghanima Jan 20 '16 at 9:42

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