Why Toshiba PA2487U battery can’t overcharge?

Question: I have a Toshiba PA2487U battery, and they say don’t overcharge about laptops barrery, but if my battery is fully charged and im on a power, is that still considered bad, and only charge full then discharge…? What should i do ? Answer: It is ONLY possible 2 overcharge if you are using a wrong ac adaptor or power supply with factory supplied power adaptors this should not happen ! they have a built-in cut-off switch which stop charging the batteries, If its can’t change .you should buy new one .underside I give you some model battery: Toshiba PA3084U-1BAS battery , Toshiba PA3084U-1BRS battery , Toshiba PA3098U-1BAS battery , Toshiba PA3098U-1BRS battery.