(Some laptop users contend that keeping a laptop plugged in damages the life of the battery. Even if battery charging systems have improved since then, common sense suggests that using AC power requires less energy. A report (PDF) prepared by the Natural Resources Defense Council five years ago estimated that running a laptop from AC power is about 20 percent more energy-efficient than doing it off a battery. In that case, you’re probably better off staying plugged in, because energy is lost in the process of charging the battery, storing the electricity, and then powering the computer from the battery. Getting back to your question, start with the assumption that your computer will operate exactly the same whether or not it’s plugged into the wall.
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