1. Turn your Sony VGN-FE790GN laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FE790GN laptop.
3. Now that your Sony VGN-FE790GN 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-FE790GN battery is removed, grab your replacement Sony VGN-FE790GN battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FE790GN battery towards the laptop and secure it in place.