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Power (W) = voltage (V) x current (A).

Voltage depends on the power source.
Current depends on the device.

For USB power delivery devices:
- The voltage is controlled by the charger. The device tells the charger how much voltage it wants.
- The current is controlled by the device. The charger tells the device what current it can supply.

It must be similar for Lightning devices except maybe lightning has only one voltage?
 
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It will switch between 5V and 9V depending on the device and charge levels, given the adapter is PD fast charging compatible.
 
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If I had to buy a charger, what would be the highest useful power to get, for charging via the Lightning port? Apple is plugging their 20W charger, is that the maximum the 14 Pro can make use of? Or is it even less, and that’s just the lowest USB-C charger they’ve got?
 
Get the charger that  recommends. A bigger charger won’t significantly decrease charging time.
 
Apple talks about the iPhone doing fast charging all the time and the phone is designed too and people still question these things, and if you are going to trade your phone within 3 years then your battery will be good until your next iPhone. People worry way too much
 
To be clear, I’m not worried about battery maintenance, it’s just that I haven’t found any specs on how much charging power the 14 Pro can use. That could be more than 20W or it could be less. Apple of course recommend their 20W charger (which I may well end up getting), because that’s probably the closest/only thing they’ve got. But I’m also looking at cheaper alternatives from reputable brands, and there I have many more options.
 
Just know that you can use any sized charger on any iPhone. Plugging it into a 100 watt charger (if one existed) would be perfectly safe & fine. The charger is actually inside the iPhone. The thing you plug into the wall is a power supply.
 
To be clear, I’m not worried about battery maintenance, it’s just that I haven’t found any specs on how much charging power the 14 Pro can use. That could be more than 20W or it could be less. Apple of course recommend their 20W charger (which I may well end up getting), because that’s probably the closest/only thing they’ve got. But I’m also looking at cheaper alternatives from reputable brands, and there I have many more options.
The Apple charger is less than $20 delivered.
It's what's recommended by the manufacturer of the phone that just cost you $1000!
How can you go wrong?
BTW, I use an Apple 20W charger for my iPhone 13 Pro.
It takes about 2.5-3.0 hours to charge from 40% to 100%.
FWIW.
 
I found my answer:
The maximum charge power the phone will use seems to be around 26W.

This video:
suggests that if you only ever charge overnight, the good old 5W charger seems like a good choice, it completes a full charge in 3h50m.
 
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To be clear, I’m not worried about battery maintenance, it’s just that I haven’t found any specs on how much charging power the 14 Pro can use. That could be more than 20W or it could be less. Apple of course recommend their 20W charger (which I may well end up getting), because that’s probably the closest/only thing they’ve got. But I’m also looking at cheaper alternatives from reputable brands, and there I have many more options.
$20 for the Apple 20watt is great deal.

Though $14 for Anker brick is even better.
 
It is absolutely ok to use 30W.

If you have the Pro Max, it will actually max out at 27W so it's crazy fast. Definitely next-gen charging for Apple for now.
 
another iPhone charging question:
will a docking charging stand that charges magnetically )backside) over-charge
an iPhone if one used a 20w  adapter?

thanks in advance!
 
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