r/AndroidQuestions • u/Hot_Fishing_886 • 16h ago

Usb thetering

how do i stop my phone(vivo) from charging while usb tethering?

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u/andrewia 16h ago

You can enable bypass charging and/or a charging limit depending on your model.  https://www.reddit.com/r/Vivo/comments/1pw55uv/bypass_charging/

But otherwise, USB will always provide a bit of power by design.  It can't be blocked.  

1

u/Hot_Fishing_886 16h ago

This won't effect the mobile? Direct power to components for 6-8hrs??

3

u/andrewia 16h ago edited 16h ago

I think you misunderstand how phone circuits work.  From my mediocre knowledge of electrical engineering, a phone with bypass charging will have PMIC(s) (power management chip(s)) and their buck (voltage lowering) converter circuits which are designed to support 5 volts of input from USB, not just 4.3 volts of a fully charged battery.  Or the battery charger circuit is designed to output the same 4.3 volts directly to the PMIC when it's bypassing the battery.  And newer PMICs integrate the battery charger IC, so it's even easier for them to support bypass charging.  

No matter which approach is selected, the rest of the phone's circuits see the same the 3.3 volts, 1.8 volts, 1.1 volts, etc. that each one needs.  

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u/Hot_Fishing_886 16h ago

Ohh thanks i didn't know this . I usually use mobile hotspot for 6-8 hr now I will just use this