The main battery (also called the power battery) is the battery pack which allows a laptop or notebook to operate independently of an AC power source. These rechargeable batteries are designed to operate the computer for a certain amount of time (generally 1 to 7 hours).

There are several types of batteries on the market:

Litium Ion

Lithium Polymer

Nickel Cadmium (NiCd)

Nickel Metal Hydride (NiMh)