1. Turn your Sony VGN-A290 laptop over.
2. Find the laptop battery release button lock for your Sony VGN-A290 laptop.
3. Now that your Sony VGN-A290 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-A290 battery is removed, grab your replacement Sony VGN-A290 battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-A290 battery towards the laptop and secure it in place.