1. Turn your Sony PCG-FX108K laptop over.
2. Find the laptop battery release button lock for your Sony PCG-FX108K laptop.
3. Now that your Sony PCG-FX108K 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-FX108K battery is removed, grab your replacement Sony PCG-FX108K battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-FX108K battery towards the laptop and secure it in place.