1. Turn your Sony PCG-Z1VAP laptop over.
2. Find the laptop battery release button lock for your Sony PCG-Z1VAP laptop.
3. Now that your Sony PCG-Z1VAP 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 Sony PCG-Z1VAP battery is removed, grab your replacement Sony PCG-Z1VAP battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-Z1VAP battery towards the laptop and secure it in place.