All of us like laptops. They are compact and light; you can easily take your laptop with yourselves when you go to work or when you are on journey or on holiday. But the most important thing is that thanks to a built-in battery, you can work with a laptop even if there is no possibility to plug the computer to power supply.
Unfortunately, the time of laptop independent is limited and may vary from 30 minutes up to 10 hours. Laptop Battery life depends on many factors: what programs you work with, whether you use cd/dvd drive, whether you use wi-fi connections and, certainly, on the quality of a certain laptop battery. It is safe to say that if your laptop is on battery and you use it for surfing the Internet, sending email, chatting or doing any other simple tasks, your laptop should be battery-operated not less than 2-3 hours. If it not so, and you can hardly get from your laptop 60 or even fewer minutes of independent work, it just indicates the fact that it is time to change your laptop battery.
Your laptop battery can wear out on many the reasons. Firstly, sooner or later any battery deteriorates, so the laptop battery life decreases. Secondly, the battery state depends on service conditions. For example, if the battery constantly heats up because of bad cooling system of your laptop or other device, its condition worsens. And at last, statistically, about 1 % of batteries (it is a lot of), gone on sale, has a factory defect, and it means, that such a battery can fail at any moment, even if you bought it just several days ago.
It may happen that you will never face the necessity of purchasing a new battery. But what should you do, if however you have the bad luck, and your laptop battery has failed, or you wish to buy the battery of higher capacity to increase laptop operating time without the necessity of additional charge. I will try to tell you below how to choose the proper battery and not to overpay.