Laptops are really popular these days. They offer all of the power and versatility of a desktop but add on to that portability and light weight. You can take a laptop just about anywhere and because of that you might be taking your laptop to places that don’t necessarily have AC power outlets available. If you know you’re not going to be able to plug your laptop in when it runs out of juice you should invest in an external laptop battery.
External laptop batteries are great for trips to the outdoors where you won’t see a power source for days at a time but still need to use your laptop for some reason. An external laptop battery will often triple the default battery life of your laptop and will provide you with tons of hours extra that you can use to watch movies or do work.