Customers are often surprised at how short-lived laptop batteries are. Laptop batteries function by consuming themselves chemically over time. Therefore, it is normal and expected for a laptop battery to gradually lose capacity. In fact, after around two years of use, most laptop batteries will barely be functioning at 50% of their original capacity. If your laptop battery is 3 years old or older, and is still working well, you might well consider that a gift. The bottom line is that a laptop battery must be considered a normal wear item, like the brakes on a car.
There isn't very much you can do to extend the useful life of your laptop battery. At one extreme, you can remove the battery entirely, and run your laptop directly from its AC adapter. The downside to this approach, of course, is that your battery will fully dischange in a few weeks. Then, if you suddenly need your computer to run on battery power, you'll have to wait 2 or 3 hours to recharge the battery. Most people are better off just leaving the battery installed.
Remember to properly dispose of any used computer batteries so they don't end up in landfills contaminating our drinking water.
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