Charging iPhone 13 and Apple Watch Series 10 simultaneously

Question

Level 1

14 points

Charging iPhone 13 and Apple Watch Series 10 simultaneously

I use a MagSafe charger with a USB-C cable to charge my iPhone 13. I also use an Apple Watch charger with a USB-C cable to charge my watch. I can use a single-port USB-C charging block with each without problem; however, if I use a 20W or a 40W multi-port charging block (USB-C ports) I cannot charge both at the same time. I can connect the MagSafe charger and the phone will begin to charge, but if I then plug in the watch the phone stops charging. It would appear that a 40W charger should be more than enough power, but apparently not. Can anyone explain why?

iPhone 13, iOS 18

Posted on May 24, 2025 2:47 PM

Answer 1

Mosscreek Author

Level 1

14 points

May 27, 2025 10:29 AM in response to Mosscreek

Here is an update. I bought the Apple 2-port USB-C charging block which, as was previously noted, is 35W. It will charge both devices simultaneously so the issue is with the non-Apple charging block that I got from Amazon. Even though it is rated 40W it won't charge both devices simultaneously.

Answer 2

ChrisJ4203

Level 10

239,227 points

May 27, 2025 12:37 PM in response to Mosscreek

A lot of 3rd party charging blocks will deliver different wattage to different ports. I have one like that, so you have to be careful about that. Check the paperwork for that block to see. Like you said, even though it is rated at 40w, it could be that the delivery on the ports can be different.

Glad that you got it sorted with the Apple adapter.

Answer 3

KiltedTim

Level 10

238,530 points

May 24, 2025 3:55 PM in response to Mosscreek

In theory, it should be fine.

Since the only 2 port USB C charger Apple makes is a 35 watt, I suggest you contact the manufacturer of the charger(s) you're having a problem with and ask them.