https://wccftech.com/magsafe-charger-requires-apples-20w-power-adapter-to-charge-iphone-12-at-full-15w-speed/

Apple's new iPhone 12 and iPhone 12 Pro models are all the hype these days. Moreover, we're all enjoying the positive reviews as of now. Alongside the iPhone 12 models, Apple also unveiled a new MagSafe charger that magnetically connects to the back of the iPhone 12. The iPhone 12 models feature magnets alongside the charging coil arranged in concentric circles. Apple promised 15W of charging speed from the MagSafe charger. However, it comes with a twist. For the MagSafe to deliver full-speed charging at 15W, Apple requires you to use its 20W power adapter which it sells separately.

Normally, you would get 7.5W of Qi wireless charging speed at maximum on the iPhone for which you can use any compatible wireless charger. However, in order to get the 15W MagSafe charging speed, you are required to buy Apple's 20W power adapter. Apple's new MagSafe charger is available to buy at $39 and the 20W power adapter is sold separately for $19. At this point in time, only Apple's 20W power adapter is compatible with MagSafe charging that delivers 15W of charging speed.