In a test (that can be watched on Max Tech’s Youtube channel below) an iPhone 11 Pro was set to charge via a MagSafe charger and at times was receiving as little as 0.96 watts – far from the 7.5 watts that the iPhone 11 Pro should be able to handle. iPhone SE also showed equally slow charging.
Macrumors has also
tested charging an iPhone XS Max with MagSafe, and confirmed that charging was very slow. In that case a half-hour charge saw only 13 percent added.
In other words, it seems like a bad idea to buy a MagSafe charger for a iPhone if it isn’t part of the
iPhone 12 series.