Cupertino giant, Apple silently released the MagSafe Battery Pack. The new $99 (In India: ₹10,900) device as the name suggests is a wireless power bank that’s able to charge the MagSafe equipped iPhone 12, iPhone 12 mini, iPhone 12 Pro, and iPhone 12, Pro Max, by attaching to the back panel magnetically. The battery pack as pointed out by 9to5Mac first is 1460mAh in capacity (zoom in to the second picture below and notice carefully). It provides 5W of output to the iPhone.
Source: Apple 
Source: Apple 
Source: Apple
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The MagSafe Battery Pack can also wirelessly charge your iPhone at up to 15W provided you connect a 20W or higher wall adaptor to the Battery Pack. The charging status will be available on the lock screen, home screen, and Batteries widget.
Neither is a 20W charger nor a Lightning to USB-C cable come bundled with the new MagSafe Battery Pack. Those have to be bought separately if required. Your iPhone 12 series has to be running iOS 14.7 and later to use the new Apple MagSafe Battery Pack.
Source: Apple
Even though there are a plethora of MagSafe compliant wireless charging iPhone battery packs available for the iPhone 12 series, Apple’s MagSafe Battery Pack is the only wireless charging battery pack that’s actually officially MagSafe-approved as of now.