1. Turn your Sony 147775221 laptop over.
2. Find the laptop battery release button lock for your Sony 147775221 laptop.
3. Now that your Sony 147775221 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 147775221 battery is removed, grab your replacement Sony 147775221 battery for installation.
6. Insert the battery into the slot. Push the Sony 147775221 battery towards the laptop and secure it in place.