Possible Duplicate:
Should laptops remain plugged in when their battery is 100% charged?
Should i use my Laptop on battery or direct on electricity. i have no problem of electricity and i use my laptop in home and no problem of getting it with me outside.
If you have electricity available, you obviously want to use that. Your battery has a limited number of recharging cycles and should be used only when necessary.
In addition to Pekka's reply, a comment:
When the laptop is not on mains power, it may enter power-saving mode, which will degrade the quality of the display or other components. For better user experience, use mains power.
