Can i use a 85 watt charger with a new macbook air

Can i use a 85 watt charger with a new macbook air that comes with a 45 watt charger. One says its 14.8 volts and the other is 20 volts.

To be clear, the wattage of the adapter is not the power delivered to the Mac, but rather the power the adapter is capable of delivering.
Think of it as the difference between a 200 HP and a 400 HP engine; both can drive at a certain speed with no issues, the difference is what happens if you floor the gas pedal.
The same is true between the higher wattage power adapter that comes with the iPad and the one that comes with iPhones; you can use the higher wattage adapter to charge and iPhone with no issue, but if you try and use the iPhone adapter to charge the iPad it may work, but it will take much, much longer.

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