This number indicates the number of individual cells used to make up the laptop battery. Generally, the more cells, the higher the capacity of the battery.

The upside to having more cells is that your laptop will last a lot longer on a single charge. Unfortunately the downside of having more cells usually means a larger, heavier battery.

Before purchasing a battery with more cells, you need to weigh up the benefits vs the extra size and weight, especially if you carry your laptop around with you all day.