1. Turn your Sony VGN-SR490PAB laptop over.
2. Find the laptop battery release button lock for your Sony VGN-SR490PAB laptop.
3. Now that your Sony VGN-SR490PAB 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 VGN-SR490PAB battery is removed, grab your replacement Sony VGN-SR490PAB battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-SR490PAB battery towards the laptop and secure it in place.