Here is a list of power banks that stick behind the iPhone 15 and iPhone 15 Pro using MagSafe magnets. All these power banks feature USB-C.
10000mAh Power Bank for iPhone 15/Pro/Max/Plus - Wireless Charging Backup Battery Portable Charger Slim 2-Port USB for iPhone 15/Pro/Max/Plus
MagDisk MagSafe SSD & Power Bank for iPhone 15+
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BENKS Magnetic Power Bank, Upgraded 10000mAh Wireless Portable Charger, for MagSafe Battery Pack with Two-Way 20W USB-C Ports, for iPhone 15/14/13/12 Series, Black : Cell Phones & Accessories
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BoostCharge Magnetic Wireless Power Bank 5K + Stand
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Momax 5000mAh MagSafe Power Bank / USB-C Wireless Charger (White)
Anker USB C Power Bank - the best portable charger for iPhone 15 Pro Max
OtterBox Multi-Mount Power Bank with MagSafe - Gray - Apple