Is it ok to power rpi3 + high current usb device with battery pack and y cable?

Question

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 05 '16 at 07:46
Because the pi cannot supply that much current through a usb port, if i understand. — user3243135, Oct 05 '16 at 07:51
USB can supply 1.2A (given an adequate PSU) See Raspberry Pi Power Limitations — Milliways, Oct 05 '16 at 08:04
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 05 '16 at 08:08
If by "batter pack" you mean a power bank sold for recharging mobile devices, be prepared for disappointment: http://raspberrypi.stackexchange.com/a/54242/5538 — goldilocks, Oct 05 '16 at 11:53

score 1 · Accepted Answer · edited Apr 13 '17 at 12:56

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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

edited Apr 13 '17 at 12:56

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answered Oct 05 '16 at 08:57

Milliways

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Is it ok to power rpi3 + high current usb device with battery pack and y cable?

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