https://www.cnet.com/news/hyper-usb-c-battery-charge-15-inch-macbook-pro-and-more/

You've long been able to buy portable batteries that'll keep your phone running even through a heavy day of thumb-typing. Soon you should be able to get one of those even for your beefy 15-inch MacBook Pro, too.

Hyper, a Sanho product line specializing in accessories that fill gaps in an Apple-centric digital life, on Monday announced the new HyperJuice portable USB-C battery that packs a whopping 100 watt-hour capacity. For comparison, the current 15-inch MacBook Pro has a 83.6-watt-hour battery.