1. Turn your Toshiba M400-S4032 laptop over.
2. Find the laptop battery release button lock for your Toshiba M400-S4032 laptop.
3. Now that your Toshiba M400-S4032 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 M400-S4032 battery is removed, grab your replacement Toshiba M400-S4032 battery for installation.
6. Insert the battery into the slot. Push the Toshiba M400-S4032 battery towards the laptop and secure it in place.