A laptop power bank is a portable device that stores electrical energy which can be use anytime to charge your laptop during power failure.
Some laptop power bank works similarly like a phone power bank but the difference is that it has a higher capacity to handle a laptop’s power consumption.
To understand how a laptop power bank works, depending how the laptop power bank is built, some power banks uses DC output, which comes with it’s own special cable and a laptop pin connector that allows you to charge directly.
While some laptop power banks have a USB-C which is capable of delivering enough energy to your laptop.
Also there are laptop power banks that have an Ac outlet, making it very easy to charge your laptop with your own laptop adapter charger.
