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MagSafe Duo Charger charges Apple Watch very slowly

I bought a MagSafe Duo Charger about 2 months ago and have only unplugged it once last week. After I plugged it back in, it has been charging my Apple Watch super slowly (about 8% in 2 hours). What’s the problem?

Posted on Apr 5, 2023 1:24 AM

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Question marked as Top-ranking reply

Posted on Apr 5, 2023 10:00 AM

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All power adapters have different ratings for the amount and rate of power delivery. The MagSafe Duo Charger requires the following ratings to deliver faster wireless charging:


  • USB-C connector (USB-A is not supported)
  • 9V/2.22A power adapter provides up to 11W of power
  • 9V/3A and higher power adapter provides up to 14W of power
  • iPhone 12 mini and iPhone 13 mini can get up to 12W for faster wireless charging with at least 9V/2.62A
  • Higher wattage adapters at or above 9V/3A will also deliver a maximum of up to 14W peak power to your iPhone


To use both the iPhone and Watch charger at the same time, the MagSafe Duo Charger requires at least 15W (5V/3A or 9V/1.67A), but this will result in slower charging.

...

copied from: How to use MagSafe Duo Charger with your iPhone and Apple Watch - Apple Support

7 replies
Question marked as Top-ranking reply

Apr 5, 2023 10:00 AM in response to Qd386

...

All power adapters have different ratings for the amount and rate of power delivery. The MagSafe Duo Charger requires the following ratings to deliver faster wireless charging:


  • USB-C connector (USB-A is not supported)
  • 9V/2.22A power adapter provides up to 11W of power
  • 9V/3A and higher power adapter provides up to 14W of power
  • iPhone 12 mini and iPhone 13 mini can get up to 12W for faster wireless charging with at least 9V/2.62A
  • Higher wattage adapters at or above 9V/3A will also deliver a maximum of up to 14W peak power to your iPhone


To use both the iPhone and Watch charger at the same time, the MagSafe Duo Charger requires at least 15W (5V/3A or 9V/1.67A), but this will result in slower charging.

...

copied from: How to use MagSafe Duo Charger with your iPhone and Apple Watch - Apple Support

Apr 5, 2023 2:35 AM in response to Qd386

Are you using one of the supported charging adapters?

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Recommended:

– 20W USB-C Power Adapter that supports 9V/2.22A (sold separately) for faster wireless charging up to 11W

– 27W or higher USB-C Power Adapter that supports 9V/3A (sold separately) for faster wireless charging up to 14W

...

copied from: MagSafe Duo Charger - Apple


Also have a look at this article:

How to use MagSafe Duo Charger with your iPhone and Apple Watch - Apple Support


Apr 5, 2023 9:57 AM in response to Qd386

The power adapter mentioned above are also made by Apple, but they provide more amps for the use with the MagSafe Duo Charger.

Does your Apple Watch charge faster, if you use the charging adapter that came with the Apple Watch, and are you using the 5V/1A power adapter, that used to come with the older iPhone models, for example?

MagSafe Duo Charger charges Apple Watch very slowly

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