1. Turn your Sony PCG-FX220K laptop over.
2. Find the laptop battery release button lock for your Sony PCG-FX220K laptop.
3. Now that your Sony PCG-FX220K 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 PCG-FX220K battery is removed, grab your replacement Sony PCG-FX220K battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-FX220K battery towards the laptop and secure it in place.