Bestbuy offers Anker MagGo 10,000mAh Power Bank (35W) for Apple Watch for $63 (reg $90) with free shipping.

Product Description:
Charge all your Apple devices on the go with the Anker MagGo Power Bank (10K, 35W). This compact, flight-approved power bank features a built-in USB-C cable, 30W fast charging, and a certified Apple Watch charger delivering up to 5W. With a 10,000mAh capacity, it provides two full charges for iPhone 15 Pro and up to 11 charges for Apple Watch Series 9—all in a travel-ready design that fits in your pocket.

• All-Around Apple Charging:
  Seamlessly charge your tech with a robust 10,000mAh power bank, featuring an adjustable Apple Watch charger and a built-in USB-C cable for quick, on-the-go power.
• Officially Certified for Apple Watch:
  Maximize your charging efficiency with the Apple-certified power bank, capable of charging an Apple Watch Series 9 to 47% in just 30 minutes.
• 30W USB-C and 5W Apple Watch Charging:
  Supports simultaneous device charging with the built-in cable or port, offering up to 30W, alongside a wireless watch charger that provides up to 5W. The power bank fully recharges in 1.5 hours with a 30W maximum input.
• Travel-Friendly Power:
  Compact as a standard mouse at just 3.7 × 2.0 × 1.3 inches, it fits effortlessly into pockets or bags. Fully flight-approved, the power bank offers hassle-free travel charging, providing about two full charges for iPhone 15 Pro and up to 11 charges for Apple Watch Series 9.
• What You Get:
  Anker MagGo Power Bank (10K, 35W, For Apple Watch), welcome guide, 24-month warranty, and our friendly customer service.