Mophie Powerstation USB-C 3XL: Lots of power for lots of money, but device compatibility is a deal-breaker
Amazon.com: mophie PowerStation USB-C XXXL - External Battery with USB-C Pd Fast Charging - Made for MacBook & Other USB Devices - Grey : Cell Phones & Accessories
Amazon.com: mophie PowerStation USB-C XXXL - External Battery with USB-C Pd Fast Charging - Made for MacBook & Other USB Devices - Grey : Cell Phones & Accessories