The Belkin BoostCharge Pro Fast Wireless Charger for Apple Watch + Power Bank 10K is a capable battery pack, but it's not cheap.
BoostCharge Pro Fast Wireless Charger + Power Bank
Belkin BoostCharge PRO 3-in-1 Wireless Charger with MagSafe for
Belkin Wireless Charger Apple Watch Power Bank 10K
Buy the Belkin BoostCharge Fast Wireless Charger for Apple Watch +
Belkin MagSafe 3-in-1 Wireless Charging Pad Fast Wireless Charging
Belkin Boost Charge Pro 3-in-1 Wireless Charging Review - Life of Man
Belkin BoostCharge Pro - Charge your Apple watch and phone on the
Belkin launches new BoostCharge Pro 2-in-1 MagSafe & Apple Watch
Belkin Boostcharge Pro Portable Wireless Fast Charger For Apple
Belkin BoostCharge Pro Fast Wireless Charger Apple Watch Power
Review: Belkin BoostCharge Pro Fast Wireless Charger for Apple
Belkin BOOST↑CHARGE PRO 3-in-1 Wireless Charging Stand with
Belkin's new power bank is a godsend for Apple Watch users going
Belkin BoostCharge Pro Fast Wireless Charger For Apple Watch +