For your first use laptop battery, you must fully drain the laptop battery until the laptop turns off of itself. After that plug in your charger and allow it charge for 12 hours or depending on what the technician has told you. 12 hours is the max and you can use it while charging. I'm not saying it would take 12 hours to charge rather it is the first charge to really awaken the ions performance after a long time. It's good to charge new laptop battery for three circles at first. After that it will take less than 2 hours to fully charge your laptop battery. Best charging time about 3 to 4 hours.
This is recommended so that the laptop battery will heat up for the time allowing ions to reawaken.