Well, i think what happens when you plug in your laptop is that it charges the battery up, but uses the wall outlet as power. If your worried about harming your battery, you can run your laptop without the battery in (at least i can with my hp dv9500t) if it is plugged into the wall. The nice thing about leaving the battery in is that if a power surge happens, you still have power. I think that is your battery is charged the laptop will simply "bypass" the battery. You should have a battery light on your laptop to let you know if it is charging.
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