1. Turn your Toshiba M505-S4980 laptop over.
2. Find the laptop battery release button lock for your Toshiba M505-S4980 laptop.
3. Now that your Toshiba M505-S4980 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 M505-S4980 battery is removed, grab your replacement Toshiba M505-S4980 battery for installation.
6. Insert the battery into the slot. Push the Toshiba M505-S4980 battery towards the laptop and secure it in place.