The battery discharges to 0V, and then shut down the state to charge 12-20 hours if your battery is not completely damaged, it should be able to charge into electricity.

Laptop battery itself has a number of uses (lithium is basically 800 times) and aging factors such restrictions, if it is seriously damaged, then only two ways resembles the:

First, in the case of the use of an external power supply; However, if in the case of an external AC power supply to ensure the best stability, with a total power failure has unplugged the computer itself will certainly damage, voltage instability, always boot off too frequently bad, just the total flash lamp will burn is a reason.

Second, configure a new battery, though not original, and can be properly maintained, then it should also be used for a long time.

Purely personal opinion, because I’m trying to get my laptop battery live longer, so check a lot of things, but it does not guarantee the absolute authority in general should be like this.