It was done years ago and that's partially how we got microusb charging to be so common in the first place. https://en.wikipedia.org/wiki/Common_external_power

It was done years ago and that's partially how we got microusb charging to be so common in the first place. https://en.wikipedia.org/wiki/Common_external_power_supply https://en.wikipedia.org/wiki/Common_external_power_supply