Woot offers (1 or 2 Pack) Aduro PowerUp Shine Qi Wireless Charging 10,000mAh Dual USB Backup Battery for $17.99 (reg $22.99). Free shipping for Prime Members.

Product Description:
The Aduro PowerUp Shine Wireless Charging 10,000mAh Dual USB Backup Battery has built-in SmartCharge technology, which will enable your device to charge at maximum speed. Charge your wireless charging-enabled device on the front pad while charging up to two other devices from the Dual USB Ports. The LED power gauge screen will confirm your device is charging and informs you of the remaining power level. 

• Charge up to 3 devices at one time using the 2 USB Ports and the Wireless charging feature
• SmartCharge feature will adjust charging output on the USB Ports to charge your device at maximum speed
• LED Digital Display will show you remaining power
• Sleek and slim design fits perfectly in your pocket or your purse so you can always take it with you on the way out
• Dual USB Ports 2.1Amp Output
• Qi wireless charging feature is compatible with iPhone 12, 11, X, 8, 8 Plus, Galaxy Note 5, S6, S6 Edge, S7, S7 Edge, S8, S8 plus, and all QI-enabled devices. 
• Large Capacity: 10,000 mAh high capacity battery.
• Convenient and Portable: Charge up to three devices at once; Two via USB, and one wireless.
• Product Dimensions: 3" x 6" x 0.5"