1. Turn your Toshiba NSK-T4N01 laptop over.
2. Find the laptop battery release button lock for your Toshiba NSK-T4N01 laptop.
3. Now that your Toshiba NSK-T4N01 laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Toshiba NSK-T4N01 battery is removed, grab your replacement Toshiba NSK-T4N01 battery for installation.
6. Insert the battery into the slot. Push the Toshiba NSK-T4N01 battery towards the laptop and secure it in place.