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joevt

Contributor
Jun 21, 2012
6,689
4,087
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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Lekro

macrumors 6502a
Mar 23, 2019
564
295
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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dotnet

macrumors 68000
Apr 10, 2015
1,601
1,295
Sydney, Australia
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?
 

now i see it

macrumors G4
Jan 2, 2002
10,701
22,465
Get the charger that  recommends. A bigger charger won’t significantly decrease charging time.
 

dominiongamma

macrumors 68020
Oct 19, 2014
2,292
5,042
Phoenix. AZ
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
 

dotnet

macrumors 68000
Apr 10, 2015
1,601
1,295
Sydney, Australia
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.
 

now i see it

macrumors G4
Jan 2, 2002
10,701
22,465
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.
 

Splitrail

macrumors 6502a
Dec 26, 2021
899
1,099
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.
 

dotnet

macrumors 68000
Apr 10, 2015
1,601
1,295
Sydney, Australia
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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JM

macrumors 601
Nov 23, 2014
4,082
6,373
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.
 

Motionblurrr

macrumors 65816
Jul 1, 2008
1,303
1,623
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.
 

MBAir2010

macrumors 603
May 30, 2018
6,433
5,920
there
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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