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I'm trying to create a portable solution where two Pi Zeros are each running a camera module. I was thinking that I would use a single phone power bank. Is it advisable/possible to take 5 volts from the pins on one Zero and send that to the usb power socket of the other? Is there a better and/or safer way of accomplishing this? Thank you.

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    Split cable from power bank? Not sure about Pi Zero but the normal one only has protection on the power port, not the USB ports, apparently. Not sure that is very important.
    – Tomas By
    Sep 20, 2018 at 17:48
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    Yes split cable like smile.amazon.co.uk/dp/… would be my preferred solution too
    – Dirk
    Sep 20, 2018 at 17:53
  • @TomasBy and Dirk please remember that answers should not be posted as comments. See raspberrypi.stackexchange.com/help/privileges/comment
    – Ghanima
    Sep 21, 2018 at 5:31

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You could use a split cable - provided you can find on with low resistance (most phone charger cables have too high resistance for the Pi).

You could connect the 5V and Gnd pins of the Pi together (don't bother trying to feed into the usb power socket) but again the voltage drop will almost certainly be excessive.

My suggestion would be to power BOTH Pi through their 5V pins (the Pi Zero has NO protection so you aren't bypassing anything). This way you can use reasonable wire sizes.

See Raspberry Pi Power Limitations

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