1. Turn your Sony PCG-FX250K laptop over.
2. Find the laptop battery release button lock for your Sony PCG-FX250K laptop.
3. Now that your Sony PCG-FX250K 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-FX250K battery is removed, grab your replacement Sony PCG-FX250K battery for installation.
6. Insert the battery into the slot. Push the Sony PCG-FX250K battery towards the laptop and secure it in place.