1. Turn your Sony PCG-FX55S/BP laptop over.
2. Find the laptop battery release button lock for your Sony PCG-FX55S/BP laptop.
3. Now that your Sony PCG-FX55S/BP 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-FX55S/BP battery is removed, grab your replacement Sony PCG-FX55S/BP battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-FX55S/BP battery towards the laptop and secure it in place.