I have acer aspire 5551 , my laptop battery charges fine but it stops on 91% and does not go further :( , what is the possible solution for it ?

i have windows 7 premium 64 bit , where can i look for tools ? i have windows 7 premium 64 bit , where can i look for tools ?

Ok, when you start the laptop go into the bios and see if there is any power options (you may also find battery calibration tool there too but if not...) turn any power managemnet option off, restart the laptop and wait until it fully loads. go into the control panal and select power, also turn any power management option off or disable hibernation at the critical battery... now wait until the battery is fully charged or can not take more then unplug the ac power, you may continue working on the computer or just let it drain the battery until it shuts off by itself, make sure you save your work because if it shuts off any unsaved data will be deleted, try turning the computer on, it should shuts down again after few seconds. now plug the ac in and let the laptop charge overnight or at least 10 hours, then turn it on and notice the charge %... then unplug the power and let it drain from the battery again until it shuts off... repeating this 2-3 times should do the trick... Good Luck. Ok, when you start the laptop go into the bios and see if there is any power options (you may also find battery calibration tool there too but if not...) turn any power managemnet option off, restart the laptop and wait until it fully loads. go into the control panal and select power, also turn any power management option off or disable hibernation at the critical battery... now wait until the battery is fully charged or can not take more then unplug the ac power, you may continue working on the computer or just let it drain the battery until it shuts off by itself, make sure you save your work because if it shuts off any unsaved data will be deleted, try turning the computer on, it should shuts down again after few seconds. now plug the ac in and let the laptop charge overnight or at least 10 hours, then turn it on and notice the charge %... then unplug the power and let it drain from the battery again until it shuts off... repeating this 2-3 times should do the trick... Good Luck.