Apple MagSafe Battery Pack
It wouldn't be fair to compile a list of the finest iPhone power banks without adding Apple's official MagSafe Battery Pack. The only thing that comes with this unit, which costs around $100, is the power bank itself—no USB-C to Lightning connector, which would have been wonderful, especially at such a premium price.
The Apple MagSafe Battery Pack has the added benefit of displaying the battery percentage of both the iPhone and the battery pack, which is useful if you need to get out the door quickly and aren't sure if there's any juice left in the charger.
The Apple MagSafe Battery is the perfect size for the iPhone 12 mini and will be much smaller when it progresses to the iPhone 13 Pro. As promised, it easily snaps into place on the back of your iPhone, which is quite nice. It also has automatic charging, so you don't have to remember to turn it on or off.
There are better value options available for the high price and the fact that you'll need to purchase a USB-C to Lightning Cable on top of that. However, if you want to stay within the Apple ecosystem, the MagSafe power bank is a dependable, high-quality option—just be prepared to pay a premium.
Link: https://www.apple.com/shop/product/MJWY3AM/A/magsafe-battery-pack