Using Power banks is normal in the world of smartphones, but in the laptop-space they are not seen that often. One of the reasons is that only a few battery packs have enough power to charge a laptop. Hoping to profit from accessory sales, the PC manufacturer Lenovo has now released a power bank made explicitly for its ThinkPad and IdeaPad laptops.
https://www.notebookcheck.net/Lenovo-releases-a-USB-C-power-bank-for-ThinkPads-IdeaPads.306164.0.html