1. Turn your Sony VGN-SZ220B laptop over.
2. Find the laptop battery release button lock for your Sony VGN-SZ220B laptop.
3. Now that your Sony VGN-SZ220B 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 VGN-SZ220B battery is removed, grab your replacement Sony VGN-SZ220B battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-SZ220B battery towards the laptop and secure it in place.