1. Turn your Sony VGN-CR590EAT laptop over.
2. Find the laptop battery release button lock for your Sony VGN-CR590EAT laptop.
3. Now that your Sony VGN-CR590EAT 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-CR590EAT battery is removed, grab your replacement Sony VGN-CR590EAT battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-CR590EAT battery towards the laptop and secure it in place.