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I recently found that if I connect a USB pair of speaker/microphone using OTG cable to a phone, it becomes the audio device by default, and I can actually play audio over that. It happens that the USB headset has much better quality than the earplug ones that I connect over audio connector.

My question is, if I use this OTG-USB-Headset trick, will it drains the battery faster than just having my earplugs connected on the audio connector?

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What you have tried now is known for long as you can see from Google search - connecting usb headset to usb on the go

  • USB on the go wiki (see Protocols section) talks of ADP and SRP protocols relevant to your usage, to conserve on the mobile battery power - translated what it means is that power is drawn from the mobile battery and not from the USB headset, even if it has battery source

.... will I drain my battery faster than just having my earplugs connected on the audio connector ?

Depends on the power rating of your USB headset- if it is more than the earplugs provided by the phone (common case), then yes it will drain faster

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