Notebook battery running out of power, do not shut down, directly plug in the power good or bad?

Users questions: Notebook battery running out of power, do not shut down, directly plug in the power good or bad? I usually like to use battery-powered, run out of power after the plug in the power then, what harm has it? Is not the case in a power supply should be as little as possible with a battery?
Experts answer: Never mind the usual laptop battery charge and discharge times 800-1000 times the number in, that is, the life span of about three years, and three years, notebooks are eliminated!
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