"It would be easy and cheaper to purchase some battery on line. But where was that battery made and when will it fail you? Purchase a genuine Lenovo battery for your Edge and know it will continue working for a long long time, be reliable in a crunch and give hours of excellent performance before requiring a charge up. It was designed specifically for your computer, is fairly easy to install and charge up. There is a confidence factor when you purchase the "real thing" as opposed to some knock-off. The cost of the genuine battery may seem high compared to the knock - offs, but when you factor into the long life of the genuine battery and the long hours of use between charge ups, this battery becomes a really great deal!"