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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 1001:  Notebooks

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IV  Docking
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NiMH
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V  Charged Up (Batteries)

One critical issue with the notebook is the battery. Once the battery goes dead, you might as well be hauling around a brick.

The first batteries for laptops (I won’t call them notebooks) were the lead-acid battery. This was replaced by the Nickel-Cadmium (NiCd) battery. While weighing less than the lead-acid, they have less total power between charges than lead-acid.

[spacer]NiCd – Use it or Lose it

Your mantra for NiCd (pronounced NI-CAD) should be "Use it, or lose it." Recharging a Ni-Cad after a brief use, and repeating this process (say while taking the same short trip every day) will result in a battery that lasts exactly that long, regardless of rating. This is known as the memory effect.

What happens is a crystalline barrier forms around the metals right at the point of maximum discharge. The only way to 'save' a battery subject to this effect is to break the barrier with a small over voltage. How much over voltage is on a case-by-case event, and a dangerous experiment. You are NOT advised to try this at home, or the office.


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