Apple’s MagSafe Battery Pack is specifically designed for the iPhone 12 line. Here’s what folks with older iPhones can to to make it work for them.
Apple’s MagSafe Battery Pack with iPhone 11 Pro
Out of the box, Apple’s MagSafe Battery Pack will work with iPhone 12 mini, iPhone 12, iPhone 12 Pro, and iPhone 12 Pro Max. MagSafe is specific to Apple’s iPhone 12 line and isn’t available in older iPhones.