1. Turn your Toshiba M305-S4820 laptop over.
2. Find the laptop battery release button lock for your Toshiba M305-S4820 laptop.
3. Now that your Toshiba M305-S4820 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 M305-S4820 battery is removed, grab your replacement Toshiba M305-S4820 battery for installation.
6. Insert the battery into the slot. Push the Toshiba M305-S4820 battery towards the laptop and secure it in place.