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