When your Macbook Air is plugged in does charging your phone using the USB port use the power from the A/C or battery power?
I do not want to subject my Macbook to excess battery drain by always charging my phone with the Macbook's battery, but when a Macbook is charged/charging with A/C power are the USB ports powered by the adapter or the battery of the Mac?
- Asked by Cathyjo S from Danville
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