Battery plugged all the time ?

If I plugged it to the power and use it all the time ,the battery wont be harm? Or I should remove the battery when I want to plug it to the power and use it ? can you tell me some advice about the battery ? I only know that I should recharge it only if it be under 20%.

Hi:
This link is provides all the information you wanted to know about battery care.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00596784&cc=us&dlc=en&lc=en&jumpid=reg_r1002_us...
Here is the specific info regarding the battery when the notebook is primarily plugged in all the time.
"Remove the battery from the notebook if the notebook will be plugged into AC power continuously (via a wall adapter or docking station) for more than 2 weeks."

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