I'm quite certain my answer is too late to help with your dilemma of avoiding a dead battery, but will hopefully help you or someone else in the future. The transfer of power would stop before damage is done. I'm most certain that this will not damage either the charger or the laptop, both have enough "smarts" in them to not do anything that will damage them. I'm quite certain it will charge the laptop while it is powered down or sleeping. I'm quite certain that your MacBook Air will take power from this charger to at least extend the battery life while in use, perhaps even have some power to spare for charging. 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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