1. Turn your Toshiba M80 laptop over.
2. Find the laptop battery release button lock for your Toshiba M80 laptop.
3. Now that your Toshiba M80 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 M80 battery is removed, grab your replacement Toshiba M80 battery for installation.
6. Insert the battery into the slot. Push the Toshiba M80 battery towards the laptop and secure it in place.