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If I keep the power cord plugged in all of the time, will it damage my laptop?

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Welcome to superuser.com! Please provide a meaningful title for your questions. "Laptops damage" does not tell anyone what the question is about. I took the liberty to fix this. –  sleske Aug 1 '10 at 21:10

2 Answers 2

No, quite the opposite. LiIon batteries (which all modern laptops use) wear out from being discharged, so using mains power when possible is advisable.

For more details see e.g. http://superuser.com/questions/12358/is-it-better-to-use-laptop-on-battery-or-on-ac-power

Edit:

Actually, the best thing for the battery is to charge it to ~%40, take it out and store it in a cool (not freezing) place, as it deteriorates quicker when it's warm. However, that may not be practical, because

a) some laptops don't work well without their battery and

b) This means you will have to remember to charge your battery before you can actually use its full capacity; this might be annoying if you often use it on the road.

In that case, best thing is to always keep the laptop plugged in, to avoid cycling the battery.

Actually, the best thing is to periodically plug and unplug the battery so it swings between 80-90% charge, but again this is probably not practical, as it has to be done manually.

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If you keep it plugged in, the battery will not have a chance to discharge. This will cause increased temperature and chemical reactions will begin to shorten the life of the battery. This will affect the battery length in the long term, but batteries can be replaced.

It will not permanently damage any components other than the battery.

Basically if you want to keep it plugged in all of the time, remove the battery at about 40% charge and store it in a cool dry place.

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-1 LiIon batteries will not deteriorate if they are not discharged (they deteriorate from being discharged). –  sleske Aug 1 '10 at 21:12
    
@MarkM: LiIon batteries are mainly worn out by charge/discharge cycles, so avoiding these is important. See e.g. batteryuniversity.com/parttwo-34.htm –  sleske Aug 1 '10 at 21:16
    
@sleske - Perhaps you should read this - thisweekinbatteries.blogspot.com/2010/02/… –  MDMarra Aug 1 '10 at 21:16
    
@sleske - In the article you linked, they even recommend removing the battery if using the notebook on outlet power for extended periods of time... perhaps you should read your own material. –  MDMarra Aug 1 '10 at 21:19
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Let's not get religious; it's a battery. Also, I up voted this answer. –  James Watt Aug 1 '10 at 21:44

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