Is a 65W, 20.0V laptop charger compatible with iPhone 16 Pro Max and iPad Air?

Yes. Note that while there may a minimum wattage required to Fast Charge your devices, there is no maximum, in short meaning you can use any wattage charger you want. The actual charger is in the iPhone which regulates the power going into it.

You are welcome.

“Is a 65W, 20.0V laptop charger compatible with iPhone 16 Pro Max and iPad Air?: can I use a 65watt 20.0 volts laptop charger to charge my iphone 16 pro max and iPad Air”

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Yes. Use a modern Apple brand charge of USB-C to USB-C, and you’ll be just fine. Bit, I’d be a bit cautious of a universal or third-party brand laptop charger.

“It’s a Lenovo 2024 charger”

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Then, I’d say go with Apple. Though this is nothing of a laptop, if you put the incorrect wattage in a laptop, then a message pops up informing your to place the correct wattage in there.