Amazon has GENDOME 15000mAh 22.5W LiFePO4 QC3.0 & PD3.0 + Wireless Charging for Apple Watch on sale for $18. Shipping is free with Prime or on $35+ orders.
About this item:
LiFePO4 Battery: Up to 3,000 charge/discharge cycles for ~10 years of use.
High Capacity: 15,000mAh (3.2V/48Wh); rated 8,000mAh (5V/3A) after voltage conversion.
Fast Charging: Supports QC3.0 and PD3.0; up to 22.5W charging speed.
Apple Watch Wireless Charging: Built-in pad eliminates the need for an extra charger, great for travel.
Dual Charging Options: Can be charged via USB or solar panel, ideal for camping and outdoor use.