By Jacob Krol TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. If you just scored an iPhone 15 or 15 Pro for Christmas, you’re likely stoked and eager to get it set up and use the laundry list of features. Second, though, is accessorizing—be it a case, a MagSafe charger, or a handy accessory, it’s a blast. And I found one of my favorite gadgets to use with an iPhone at a significant discount on Amazon. This Anker 622 battery pack is a record 47% off at $37 in “Misty Blue.” It magnetically attaches to the back of…