1. Turn your Sony PCG-FX11J laptop over.
2. Find the laptop battery release button lock for your Sony PCG-FX11J laptop.
3. Now that your Sony PCG-FX11J 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-FX11J battery is removed, grab your replacement Sony PCG-FX11J battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-FX11J battery towards the laptop and secure it in place.