It’s a battery

Though technically a battery has multiple cells, we are accustomed to calling a single energy cell a battery as well.

In electronics, a battery or voltaic cell is a combination of many electrochemical Galvanic cells of identical type to store chemical energy and to deliver it in the form of electricity. The battery cells combine to produce more energy (voltage or amps) than a cell by itself. When joined in this way, it is a battery of cells. Almost all portable electronics use one or more cells – rechargeable or disposable. The more cells, the more energy available – meaning more hours of use usually.

In Notebook computers, the battery case usually holds three or more cells. 3 Cell batteries tend to provide about 1-3 hours of use, depending on the energy needs of the Laptop. 6 cell (or more) batteries provide much more energy, and many more hours of use. This can be good or bad! More cells mean longer use, but more weight too!