MyCharge calls its new line of magnetic power banks Superhero MagLock, implying that they're real saviors. I was impressed by their design. Not only do the batteries, which come in various capacities, have strong magnets and stick really well to the back of your iPhone 12 or 13, but they have raised coils, which are supposed to help with reducing heat levels while charging. It does seem to work.
The 3,000-mAh battery is lightweight and slim and it's nice to have around for some emergency charging. However, it won't get you a full charge, so you'll probably want to step up to one of the higher-capacity options like the 6,000-mAh model, which retails for $60 but is currently being discounted to $40 on Amazon. The 9,000-mAh version is beefy and feels like your phone is attached to a small brick -- the battery and phone do fit in your hand nicely, but the combo certainly isn't pocket-friendly.
All the MagLock batteries charge Qi-enabled iPhones at 5 watts, although you can get faster charging if you go wired and use a USB-C to Lightning cable. I also liked how there's a chime when the charging starts and your phone tells you how much juice is left in the battery pack (it's tied into iOS 15). You can wirelessly charge Android devices as well but the MagLock won't stick unless you have a metal ring on the back of your phone's case (stick-on rings are available).
The SuperHero MagLock is available in a few colors and has a glossy finish. It's currently the best designed magnetic power bank -- better even than Apple's.