The Truth About Notebook Battery

Its one of the most important and least understood parts of your notebookand it provokes so many unanswered questions

. Why do laptop batteries gradually lose their ability to hold a charge? Why does it takes longer for a charging notebook to go from 80 to 100 percent charge than it does to go from zero to 80 percent? Whats the difference between a three-cell and a six-cell battery? Rather than shrug our shoulders for another day, we demanded answers from two experts, Matt Kohut, worldwide competitive analyst at Lenovo; and John Wozniak, Ph.D. distinguished technologist at HP.LAPTOP: At what point during battery0880 life cycle does a typical notebook Dell inspiron 6400 battery last longest?Kohut: The industry average is about 30 percent degradation per year. Youll probably start to notice after about six months.John Wozniak: Batteries tend to fade pretty quickly over the first 10 or 20 cycles, and then capacity levels off.How long does a typical Dell inspiron 640m battery last?Kohut: Roughly, 350 charge cycles. A cycle is cumulative use that reaches 70 percent degradation, or seven times when 90 percent of the battery capacity was used.What causes a battery to lose capacity over time?Wozniak: Think of a Dell Inspiron E1705 Battery as having pores, where the electrons flow back and forth between the cathode and the anode. When those pores get clogged, you cant move the electrons as efficiently anymore. Then the lithium gets bound up on one side or the other, and it no longer contributes to the movement of electrons. It gets backed up.Do you need to build up a battery memory, or condition it, to get the best performance?Kohut: This was true in the lithium-metal hydride days, however, with a standard lithium-ion battery, you just need to make sure you Dell inspiron 1525 battery charge it fully. Most batteries ship from the manufacturers with an 80 percent charge.Conditioning, meaning draining the battery to zero and then charging battery fully while Windows monitors it, resets the curve. It doesnt prolong the Dell latitude d420 battery life, but it improves accuracy [of the battery monitor]. Over time, the accuracy drifts in the Windows program that measures battery life. That is why it can say that you suddenly went from 80 to 20 percent in five minutes.

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