Design
The MagSafe Battery Pack has a rectangular design that matches the shape of the iPhone, and it attaches to the back of an iPhone 12, 12 mini, 12 Pro, or 12 Pro Max to provide extra power.
Interaction With Other MagSafe Accessories
The MagSafe Battery Pack can be attached to a naked iPhone or to an iPhone with a MagSafe case attached. If you use a leather charging case, Apple warns that the case might show imprints from the compression of the leather, which is normal. Those concerned about the imprints should use a non-leather case.
Because the MagSafe Battery Pack needs direct contact with the iPhone, accessories like the MagSafe Wallet need to be removed.
Compatibility
The MagSafe Battery Pack works with the iPhone 12 mini, the iPhone 12, the iPhone 12 Pro, and the iPhone 12 Pro Max. It will charge other devices like the iPhone 11 lineup and the AirPods because it’s just Qi-based wireless charging, but only the iPhone 12 models have magnets to keep the MagSafe Battery Pack in place. iOS 14.7 or later is required.
How to Buy
The MagSafe Battery Pack can be purchased from the Apple website for $99 or from Apple retail stores.
A P 
Sean Lee 
Life-and-share 
Hazel Yu