1. Turn your Sony VGN-SR490JCN laptop over.
2. Find the laptop battery release button lock for your Sony VGN-SR490JCN laptop.
3. Now that your Sony VGN-SR490JCN 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-SR490JCN battery is removed, grab your replacement Sony VGN-SR490JCN battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-SR490JCN battery towards the laptop and secure it in place.