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ZacKaffeine

macrumors 6502
Original poster
Sep 9, 2016
415
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Noticed that the only compatible power brick listed for the Apple Watch Ultra is the new 35W one, despite the series 7 only requiring an 18W. I reached out to apple and they confirmed this to be accurate. Guess I need to return the 20W I just bought and spend $60 for the brick alone. Neat.

Despite me not specifically asking about the series 8, I believe it will also require the 35W as it is the only compatible one listed for that as well.
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Noticed that the only compatible power brick listed for the Apple Watch Ultra is the new 35W one, despite the series 7 only requiring an 18W. I reached out to apple and they confirmed this to be accurate. Guess I need to return the 20W I just bought and spend $60 for the brick alone. Neat.

Despite me not specifically asking about the series 8, I believe it will also require the 35W as it is the only compatible one listed for that as well.
View attachment 2062189
View attachment 2062191
I would recommend everyone purchase this charger quickly before this becomes back ordered as soon as everyone finds out you need it to fast charge. I just ordered mine from Apple with free shipping delivers September 19. I purchased the new compact model.
 
I would recommend everyone purchase this charger quickly before this becomes back ordered as soon as everyone finds out you need it to fast charge. I just ordered mine from Apple with free shipping delivers September 19. I purchased the new compact model.
Idk why it would be any different than the non-compact model, but the compact model is not listed as being compatible with the Ultra or 8. Sorry for not mentioning that before.
 
On the watch compare page it says in the footnotes (21 and 22) they tested fast charging with the Apple 20W USB-C Power Adapter (Model A2305). So I think the specialist gave you a wrong information.
This is really good to know. I just don't know which information is most accurate, because the apple store only has the 35W brick as being compatible. Maybe the other bricks' pages haven't been updated, but other older products have been updated if compatible (Belkin's Boost Pro Fast Charger for Apple Watch). Either way, thank you for posting that!

Edit: I am definitely leaning more towards believing the compare page over the support agent. My only hold up is still the compatibility listings.
 
The 35W is dual. Wouldn’t that split to less than 20W each? Also, from the compare site at Apple:

  1. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charging USB-C Cable. Testing conducted by Apple in August 2022 using preproduction Apple Watch Ultra (GPS + Cellular) paired with an iPhone; all devices tested with prerelease software, Apple Watch Magnetic Fast Charging USB-C Cable (Model A2515), and Apple 20W USB-C Power Adapter (Model A2305). Charge time varies with region, settings, and environmental factors; actual results will vary.

eta: sorry, I see others have pointed it out. Anyway, their support chat people told me no other bands were compatible with the Ultra other than the 3 ones that come with. They really don’t know very much.
 
The 35W is dual. Wouldn’t that split to less than 20W each? Also, from the compare site at Apple:



eta: sorry, I see others have pointed it out. Anyway, their support chat people told me no other bands were compatible with the Ultra other than the 3 ones that come with. They really don’t know very much.
Very true. That's why the only thing hanging me up is the compatibility listings.
 
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Extremely unlikely you’ll need 35W for fast-charging Apple Watch Ultra. Apple Watch Series 7 (and presumably 8) only pulls 5W of power (up from 2.5W for previous generations). Even the iPhone “fast-charges” over MagSafe using just 20W. Do you seriously think a watch is going to pull more power than a phone?

In its support article About fast charge on Apple Watch Series 7, Apple clearly states that it only pulls 5W, but says you need an 18W charger or higher, only because that’s what Apple sells:
You also need one of these power adapters:

  • Apple 18W, 20W, 29W, 30W, 61W, 87W, or 96W USB-C Power Adapter
  • A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD) of 5W or greater
Wait and see is the sensible approach here. Apple will have an updated support article soon enough. Not like your Ultra is going to explode if you don’t fast-charge it for a few days. My personal expectation is 7.5W just like non-MagSafe charging for iPhone: a reasonable bump in power draw for the slightly larger battery. Chances are, if you’ve got a 20W power adapter (the lowest PD charger you can readily find), it will work just fine with Ultra.
 
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It's the loss of power going to the watch because it's wireless charging... The power adapter must provide more than the watch can accept to compensate for the loss of power during the crossing of devices.
 
I just did a quick search in Apple Store App and i only saw the Dual 35W charger. i was not able to find a 35W single charger.

I thought the 35W Dual would provide 35W on each port, am i wrong?
 
I just did a quick search in Apple Store App and i only saw the Dual 35W charger. i was not able to find a 35W single charger.

I thought the 35W Dual would provide 35W on each port, am i wrong?
This might help you:

"To charge two devices, connect your devices to either port on your power adapter. When you connect two devices, power is automatically distributed between them based on their power requirements. For most devices, power is shared evenly when you have two devices charging at the same time. For example:

  • If you connect a Mac notebook and an iPhone or iPad, each device receives up to 17.5W.
  • If you connect an iPhone and an iPad, each device receives up to 17.5W.
  • If you connect a Mac notebook or iPhone and an Apple Watch or AirPods, the Mac notebook or iPhone receives up to 27.5W and the Apple Watch or AirPods receive up to 7.5W.
If either device needs more power, unplug the other device and its charging cable from your power adapter."


Source: https://support.apple.com/en-us/HT213263
 
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This might help you:

"To charge two devices, connect your devices to either port on your power adapter. When you connect two devices, power is automatically distributed between them based on their power requirements. For most devices, power is shared evenly when you have two devices charging at the same time. For example:

  • If you connect a Mac notebook and an iPhone or iPad, each device receives up to 17.5W.
  • If you connect an iPhone and an iPad, each device receives up to 17.5W.
  • If you connect a Mac notebook or iPhone and an Apple Watch or AirPods, the Mac notebook or iPhone receives up to 27.5W and the Apple Watch or AirPods receive up to 7.5W.
If either device needs more power, unplug the other device and its charging cable from your power adapter."


Source: https://support.apple.com/en-us/HT213263

Thank you very much, wasn’t aware 🍻
 
I will use the same 5 watt cube charger I have used on all my Apple watches. My watch will charge while sleeping and I am in no hurry. My ordered Ultra will get the same treatment.

Fast charging will decrease battery life.
 
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