We suggest you'd better remove the battery from laptop when you use your laptop with the AC adapter.
As we know, the life of your laptop battery is related to recharge and discharge times. The normal time of a battery are usually 400 to 600 times. Among the most improvement can be achieved 800 times. Although some manufacturers have improved the protection of the battery, only a few battery can be recharged after the power of it is less than 95%. Moreover, the discharge of laptop battery every minute, unless you reload. If we recharge the battery every time we use our laptop, this is short battery life of portable battery.
Another issue that requires our attention is that we keep the laptop battery pa-1900-02d has enough power to discharge. So if you typically use your laptop with the AC adapter and remove the battery, recharge the battery from time to time.