Use the recovery method: unplug the external power supply, with battery power until the computer automatically shut down (not standby, standby, you wake up the computer to continue to use), and then shut down charging, fully charged and then used to automatically shut down, twice on it (don't engage in too many times, but also damage to the battery), the results of the restoration of the outcome, nothing else can be done unless the battery is changed.
When you normally use a period of time to press this method of restoration once, the battery is good.