1. Turn your Toshiba F40 laptop over.
2. Find the laptop battery release button lock for your Toshiba F40 laptop.
3. Now that your Toshiba F40 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 Toshiba F40 battery is removed, grab your replacement Toshiba F40 battery for installation.
6. Insert the battery into the slot. Push the Toshiba F40 battery towards the laptop and secure it in place.