1. Turn your Sony VPCF126FM laptop over.
2. Find the laptop battery release button lock for your Sony VPCF126FM laptop.
3. Now that your Sony VPCF126FM 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 VPCF126FM battery is removed, grab your replacement Sony VPCF126FM battery for installation.
6. Insert the battery into the slot. Push the Sony VPCF126FM battery towards the laptop and secure it in place.