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I want to supply a rpi3 + a high-current (up to 450ma) usb device portably. Is it ok to get a battery pack with two usb outputs, attach the rpi3 to it, attach the data end of the y cable to the rpi3, and the power end to the battery pack?

Or, is there a better way to do this?

I ask because I've read that Y-cables are not really part of the USB standard.

As a side question, am I correct to assume that it would not be okay to power the rpi3 through a wall plug, and a usb device with a y-cable and battery pack, since the two devices would not share a common ground?

  • Your question is unclear - what does "power the rpi3 through a wall plug, and a usb device with a y-cable and battery pack" mean? Why not just power your USB device from the Pi3 USB ports? – Milliways Oct 5 '16 at 7:46
  • Because the pi cannot supply that much current through a usb port, if i understand. – user3243135 Oct 5 '16 at 7:51
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    USB can supply 1.2A (given an adequate PSU) See Raspberry Pi Power Limitations – Milliways Oct 5 '16 at 8:04
  • I.... I did not know that, thank you. I must've been reading the wrong things. That solves everything. If you make an answer, I'll mark it as chosen. – user3243135 Oct 5 '16 at 8:08
  • If by "batter pack" you mean a power bank sold for recharging mobile devices, be prepared for disappointment: raspberrypi.stackexchange.com/a/54242/5538 – goldilocks Oct 5 '16 at 11:53
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is there a better way to do this

Just power your USB device from the Pi3 USB ports which can supply 1.2A (given an adequate PSU) See Raspberry Pi Power Limitations

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