1. Turn your Toshiba PSAA9L-02Z00C laptop over.
2. Find the laptop battery release button lock for your Toshiba PSAA9L-02Z00C laptop.
3. Now that your Toshiba PSAA9L-02Z00C 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 PSAA9L-02Z00C battery is removed, grab your replacement Toshiba PSAA9L-02Z00C battery for installation.
6. Insert the battery into the slot. Push the Toshiba PSAA9L-02Z00C battery towards the laptop and secure it in place.