1. Turn your Sony PCG-GRT290Z laptop over.
2. Find the laptop battery release button lock for your Sony PCG-GRT290Z laptop.
3. Now that your Sony PCG-GRT290Z 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-GRT290Z battery is removed, grab your replacement Sony PCG-GRT290Z battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-GRT290Z battery towards the laptop and secure it in place.