MagSafe Duo Charger doesn't support Apple Watch Series 7 fast charging

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Apple's MagSafe Duo Charger, which was released in 2020, can't fast charge the new Apple Watch Series 7, the company has confirmed.

The $129 MagSafe Duo Charger, released alongside the iPhone 12, can charge an Apple Watch and an iPhone simultaneously. However, it won't support the new fast charging feature introduced on the 2021 Apple Watch Series 7 models.

"MagSafe Duo Charger doesn't support fast charging with Apple Watch Series 7. To fast charge your Apple Watch Series 7, use the Apple USB-C Magnetic Fast Charging Cable," Apple wrote in a support document update on Friday.

The MagSafe Duo Charger uses a standard fast charging puck. Getting fast-charge speeds on the Apple Watch Series 7 requires an updated puck. Apple has yet to update the MagSafe Duo with the necessary hardware.

Apple published a support document earlier on Friday detailing some of the requirements for fast charging on the Apple Watch Series 7. In addition, the fast charging feature itself is said to be able to charge up an Apple Watch up to 33% faster than standard charging, reaching an 80% charge in just 45 minutes.