1. Turn your Sager NP4320 laptop over.
2. Find the laptop battery release button lock for your Sager NP4320 laptop.
3. Now that your Sager NP4320 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 Sager NP4320 battery is removed, grab your replacement Sager NP4320 battery for installation.
6. Insert the battery into the slot. Push the Sager NP4320 battery towards the laptop and secure it in place.