Bestbuy offers Energizer 10,000mAh Slim 20W Magnetic Wireless Power Bank for $16 (reg $35) with free shipping.

Product Description:
10,000mAh lithium polymer battery with USB-C PD input/output. Supports up to 15W magnetic wireless charging and 20W total output. Slim and lightweight at just .62 inches. Smart Charging Control protects against overcharging and short circuits

• Capacity
  10,000mAh lithium polymer battery
• Input/Output
  15W Wireless, Qi1, Q2, MagSafe Compatible output and 18W USB-C PD output
• Wireless charging
  15W Wireless, Qi1, Q2, MagSafe Compatible output
• Ultra slim Metal Construction
  Ultra-slim Metal Material just .62 inches thin
• Smart protection
  Smart protection prevents overcharging and short circuits.
• iPhone 16/15/14/13/12 Magnetic Charge
  Strong magnets offer a firm attachment to iPhone 16/15/14/13/12 and keep the phone in place while you charge.
• LED Power Indicator
  LED power indicator shows the battery charging status in a glance.
• Double Up on Speed
  Enjoy 15W ultra-fast wireless charging and power up your devices 2X faster*. Get your iPhone 15 from 0 to 50% in just 44 minutes.
• Universal Compatibility
  Charge smartphones, tablets, smartwatches, headphones, earbuds, and more.
• USB-C Cable Included
  USB-C Cable Included for recharging the power bank or your device.