A laptop computer battery should last between two and four years, or around 1,000 full charges. The total lifetime of a battery is dependent on several factors. These factors include battery type (NiCad, NiMH, or Li-ion), how often the battery is used, and its age.

For most lithium-ion laptop batteries, the time it takes for them to lose 80 percent capacity is one to two years. For manufacturers that use cycles, it's a little more complicated. One cycle is consumed each time a laptop battery is charged or discharged.

Take a Look. One of the easiest ways to determine what kind of battery you have is to turn off and unplug your laptop and then remove the battery to look at it. Most batteries will have a set of printed information on them, including the battery type, its model number, a part number, its voltage and a charging current.

Unplug the laptop, wait a few minutes, then plug it into an outlet in a different room. Some users report that a laptop power adapter can temporarily stop working to protect itself from a perceived issue with the power supply. If your battery is removable, take it out while the power source is disconnected.

When you laptop can not use,you had bettter change a laptop battery.
Get reader for sticker shock: laptop batteries are expensive. Prices vary from one model to another, but it's not uncommon for new power packs to sell for $100 or more. I've seen some as high as $150. When you consider that brand-new laptops now sell for as low as $300, that can be a tough pill to swallow.

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