1. Turn your Sony VGN-FE890N laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FE890N laptop.
3. Now that your Sony VGN-FE890N 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-FE890N battery is removed, grab your replacement Sony VGN-FE890N battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FE890N battery towards the laptop and secure it in place.