Apple on Thursday released a support document explaining the best practices for the MagSafe Duo charger, which allows users to simultaneously charge the iPhone 12 and Apple Watch with the Legacy 29W Power Adapter.
According to the support webpage, the Apple 29W USB-C power adapter is not compatible with the MagSafe Duo. The company replaced the 29W model with the 30W version in 2018.
Quickly examine the features of the Magsafe Duo as the charger does not work with the old adapter.
Apple claims that the dual charging accessory requires at least 15W of power (5V / 3A or 9V / 1.67A) to juice the iPhone and Apple Watch at the same time. The 29W power adapter did not receive accurate power delivery features.
Wireless charging rates are also documented, with Apple claiming 11W of power for the 9V / 2.22A power adapter and 14W for adapters rated 9V / 3A or higher. When the iPhone 12 Mini 9V / 2.62A output reaches a maximum wireless charging rate of 12W, 9V / 3A or higher adapters provide a maximum power of 14W higher than other iPhone 12 models.
To learn more about power delivery profiles and the fact that Magusaf is not charging at 15W with some adapters, read AppleInsider’s in-depth description.