1. Turn your Toshiba PSAF0U-02K009Z laptop over.
2. Find the laptop battery release button lock for your Toshiba PSAF0U-02K009Z laptop.
3. Now that your Toshiba PSAF0U-02K009Z 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 PSAF0U-02K009Z battery is removed, grab your replacement Toshiba PSAF0U-02K009Z battery for installation.
6. Insert the battery into the slot. Push the Toshiba PSAF0U-02K009Z battery towards the laptop and secure it in place.