One of the most important parts of your laptop is the battery. It's not just the devices that power the computer. The battery actually makes the laptop what it is, which is a mobile computing device.
Unless you have a premium laptop alternative batteries and accessories, a laptop is really just an expensive, small desktop computer because you need to plug it into a power outlet for maximum performance.
Image Source: Google
When you buy a laptop, manufacturers usually install a low-end battery. If you are lucky, you can charge it effectively for two hours. The life of these batteries is usually very limited.
This means you'll likely be looking for a new battery in about a year. If you add them, you may need to buy a battery or two over the life of your laptop.
Some people keep extra chargers and batteries in reserve, especially if they travel a lot and/or rely on their laptops for work. The last thing you want is for your laptop to die during an important sale or some other task.
Most people mainly consider the cost of batteries and chargers. However, this is usually a bug. Chances are, you end up getting what you paid for, and a cheap laptop battery will likely come at a lower price because it will perform poorly.
But that doesn't mean the most expensive battery is the best. You need to find a battery that offers great performance and is offered at a good price.