1. Turn your Sony VGP-S111FM laptop over.
2. Find the laptop battery release button lock for your Sony VGP-S111FM laptop.
3. Now that your Sony VGP-S111FM 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 VGP-S111FM battery is removed, grab your replacement Sony VGP-S111FM battery for installation.
6. Insert the battery into the slot. Push the Sony VGP-S111FM battery towards the laptop and secure it in place.