Inferior battery manufacturers are prone to using low-grade battery cells with few life cycles as a way to cut costs. With a low-grade battery, you end up with an expensive paperweight after only a couple of months. Unlike most laptop batteries on the market today, Avant Products, guarantee each and every battery with a 1-year warranty! Avant Products, use only lithium-ion batteries with grade "A" cells, recognized as the best available grade of battery cells with the longest runtimes and cycle life. For a superior laptop battery that won"t cost more than the laptop it"s installed in, choose Avant Products!