Possible Duplicates:
Is it better to use laptop on battery or on AC power?
What is it that kills laptop batteries?
I've heard that using a laptop computer on battery mode on a regular basis (at least two hours a day) Can prolong the battery's lifetime.
I'm not talking about increasing its duration per charge cycle, but its years of usefulness.
Is this true?
Answer
This reminds me of a recent Slashdot article, watch the video and it should become pretty apparent why constant charging it is not a good idea. So to answer your question if you have a lithium ion batter which most laptops have (I can't think of any laptops with nicad) it is not good to constantly charge and discharge the battery.
from the article:
As lithium ions flow from the positively charged cathode into the 200-nanometre diameter wires of tin oxide that make up the negatively charged anode, the nanowires writhe and bulge, causing them to expand up to 2.5 fold. The wires also change structure from a neatly ordered crystal to a disordered glassy material.
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