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Charge iPhone with MacBook Pro question

FridgeToaster

FridgeToaster

macrumors member
Original poster
Sep 13, 2018
55
122
I always charge my iPhone with my Mac at work. As long as I can remember the charging current was always 2.1A (500mA current with 1600mA extra operating current), but somehow right now it's only 0.5A, there is no extra operating current. Has anyone encountered the same issue?

My iPhone is iPhone 12 Pro, connected to the MacBook Pro 14" (M1 Pro) via an Apple USB-C to Lightning cable.

Screen Shot 2022-10-24 at 15.59.59.png
 
somebody correct me if I am wrong but lightning is just USB 2.0 and from Wikipedia:

"The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected USB devices.

A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0."
 
FWIW, I have M1 MBA and with iPhone 13 plugged into USB, Current Available & Required is 500mA, while Extra Operating Current is 1900mA.
 
astorre said:
somebody correct me if I am wrong but lightning is just USB 2.0 and from Wikipedia:

"The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected USB devices.

A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0."
Click to expand...
Mac always provide more power than standard USB specification when iOS device is connected, but strangely, not my case
 
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FridgeToaster said:
Mac always provide more power than standard USB specification when iOS device is connected, but strangely, not my case
Click to expand...
did you try different cable?

apple.stackexchange.com

How do Apple's USB Power Adapters allow for more power output than is possible in the USB 2.0 specification?

From my understanding, the USB 2.0 specification allows for a maximum power draw of 2.5w - but Apple's own USB Power Adapters allow for a maximum of 12w using a USB to Lightning cable. How is this
apple.stackexchange.com apple.stackexchange.com
 
Yes I am having the same issue. Just switched from a 2019 MBP 16" to a (second hand) 2022 MBP 14" and now my iPhone doesn´t charge anymore. The extra operating current is at 0mA. Cable is fine, wallcharging works fine.

Screenshot 2022-10-31 at 15.02.43.png
 
Update. I tried with a different USB-C to Lightning cable, and a different USB-C port on my computer, no difference on the charging current.
 
Guys, I too am used to charging my iphone with my macbook. My ancient 2018 macbook pro charges my iphone quickly, but the m1 16" macbook pro charges only so slowly, 500 ma just like everyone else mentioned. Any fix here?
 
I've got a 14" and a XS. Since Ventura my iPhone doesn't charge or charges 1% in an hour when connected with a apple usb-c lightning cable. It does show I'm getting 1900 extra current.
 
Update: With Ventura, my MacBook Pro now charges iPhone with 2400mA current (500 + 1900 extra).
 
Just been checking mine this morning, and is charging ok on new m2 also, %'age been climbing fairly quickly last 15 mins.
 
tbjohnson said:
I've got a 14" and a XS. Since Ventura my iPhone doesn't charge or charges 1% in an hour when connected with a apple usb-c lightning cable. It does show I'm getting 1900 extra current.
Click to expand...
I think I did witness this happening, but suspect it was due to optimised charging on phone at the time I tested.
 
Same issue for me: M1 MacBook Pro 14" (Ventura 13.2.1) + iPhone XS (iOS 16.3.1), charging with an Apple USB-C to lightning cable.

Like others, when my phone is plugged into my MBP, it barely charges. Leaving it attached to my computer overnight, it charged roughly 20%. According to System Information, I'm getting the extra 1900 operating current, but it really don't seem that way.

Do we know if this is specific to Apple Silicon? Or specific to certain iPhone models? Right now it looks to be isolated to Apple Silicon + iPhone XS or XR.

Looks like a similar thread here, https://discussions.apple.com/thread/254340132.
 
Last edited:
Following up: I just tried charging my wife's iPhone 12 mini and there was no issue.

This seems to be isolated to specific iPhone models (XS and XR, so far).
 
I can report that it appears to be isolated to the XS and XR models. I’m on Monterrey and charging an older IPhone 8 Plus results in fast Charging Using the m1 macbook pro. My XS max charges very slowly with the same cable or laptop.
 
Sorry I can't add anything to this but just wanted to add that i too am having the same issues. macbook M1 pro with iphone xs charging slowly via usb-c. quite the downgrade when i upgraded from my macbook 2015🤦‍♂️
 
I haven't been tracking after any updates but I just plugged it into my XS into my macbook pro 14 M1 today and it's charging as expected. No more 1% per hour!
 
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