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leave it...its not 100%accurate
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I agree with both comments.<br />
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Just to add to Havalchy's comment:<br />
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The actual cause is the cells inside the battery. The IBM thinkpads of that time used NiCad AA batteries in teh battery pack. If you overcharge them or use the laptop until they are dead and only charge it to 50% you risk the cells developing what is called memory. This is common with all NiCad cells, that is why we use Lithium now as they are not as volitile. 
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Just to add to Havalchy's comment:

The actual cause is the cells inside the battery. The IBM thinkpads of that time used NiCad AA batteries in teh battery pack. If you overcharge them or use the laptop until they are dead and only charge it to 50% you risk the cells developing what is called memory. This is common with all NiCad cells, that is why we use Lithium now as they are not as volitile.

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I am using an IBM Thinkpad with Windows 2000 Professional. However, the power meter would only shows up as 99% even when fully charged. When the charge goes down to warning level and I turn on the AC power to recharge it, after fully charged the meter would shows the battery level as 99% only. Is there anyway to have it show as 100%? Why doesn't it shows the correct level? Or is it really only at 99% charged?<br />
<br />
Appreciate any pointers<br />
&nbsp;
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I am using an IBM Thinkpad with Windows 2000 Professional. However, the power meter would only shows up as 99% even when fully charged. When the charge goes down to warning level and I turn on the AC power to recharge it, after fully charged the meter would shows the battery level as 99% only. Is there anyway to have it show as 100%? Why doesn't it shows the correct level? Or is it really only at 99% charged?

Appreciate any pointers
 

Why battery does not charge to 100%?

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.

Laptops Notebooks

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.