There are different types of laptop batteries available for various vendors. There is always a change in the technology of the laptops but there is no change in the technology of the batteries they are only available into different forms. Today there are three different types of batteries available in the market and there is a difference in all of them and by knowing the features of all the battery you sill surely get confused for choosing one of them.
The three different types of laptop batteries are Nickel cadmium, nickel metal hydride and lithium ion battery. Nickel cadmium batteries are the first rechargeable batteries built for laptops. It was a boon for manufacturers because the cost of building this battery was relatively very low. But the drawback was that they were heavier then the others. Li-Ion batteries are light in weight so they are used mostly these days.