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Is there a way to find out how much current or power a USB-OTG device can draw while connected to my phone? I'd be happy with something like:-

  • an online database like GSMArena with details for lots of phones
  • an app I can run on the phone to find it out e.g. from the USB host driver in the kernel
  • a file in /proc or /dev I can read (as root, if necessary)

I'd rather not have to test it with hardware by connecting a USB peripheral to it and increasing its current draw until it stops working.

The particular phone I'm interested in is a Nexus 5, but I'm really looking for an answer that's applicable to any phone (that supports USB-on-the-go).

  • You can try the Battery Historian tool(written in Python & Go programming) to analyze your battery consumption details with a graphical view. I don't have an USB OTG device to test this tool. So I'm not sure if this will surely help you. But you can give it a try. Hope this helps ;) – Lucky Aug 11 '15 at 10:34
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I'm not sure this is entirely correct on Android, but on Linux, lsusb -v tells a lot about USB devices, including their maximum current output. If you can get usbutils on Android, that might tell you.

  • Wouldn't that only tell me the max current draw requested by a connected peripheral? – Dan Hulme Aug 11 '15 at 10:07
  • Hmm, oh well. @Dan Hulme You could get around that by plugging in something that you know will request a lot, like another phone or a battery pack. – Stephen Angelico Aug 11 '15 at 11:57

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