First of all let me ask how old is the battery, if it`s new-discharge the battery until pc shuts down itself because of low battery, remove the battery , unplug AC charger from laptop, wait for 5 minutes, then hold power button for 5 full seconds, wait another 5 minutes, then put battery and ac charger on , don`t turn on laptop yet, wait until battery indicator shows that battery fully charged, then remove AC charger, and turn on laptop. P.S. you can try this on old battery too, but usually worthless, because old batteries are not recognizable by system currectly ..