1. Turn your Toshiba U405D-S2850 laptop over.
2. Find the laptop battery release button lock for your Toshiba U405D-S2850 laptop.
3. Now that your Toshiba U405D-S2850 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 U405D-S2850 battery is removed, grab your replacement Toshiba U405D-S2850 battery for installation.
6. Insert the battery into the slot. Push the Toshiba U405D-S2850 battery towards the laptop and secure it in place.