1. Turn your HP NSK-H4E01 laptop over.
2. Find the laptop battery release button lock for your HP NSK-H4E01 laptop.
3. Now that your HP NSK-H4E01 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 HP NSK-H4E01 battery is removed, grab your replacement HP NSK-H4E01 battery for installation.
6. Insert the battery into the slot. Push the HP NSK-H4E01 battery towards the laptop and secure it in place.