The 7.5 watts you will get from your phone charger is 1/4 what you would get from the Apple charger that came with the laptop. The supported USB-BC charging rate from this charger is likely 5 volts at 1.5 amps. These chargers will fall back to USB-BC charging for backward compatibility with older One Plus phones. A bit of research tells me that this charger is likely using a charger protocol called VOOC or Dash Charge. This is because 5 volts at 4 amps is not a valid USB-PD power profile. I've discovered that in a situation like yours my MacBook Pro will charge slowly from a 12 watt iPhone power supply that uses USB-BC and Apple's BrickID for charging.īased on what I know from USB-PD I believe your One Plus charger does not support USB-PD. Apple laptops with USB-C, and the power supplies that come with them, will use USB-PD for charging.
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