1. Turn your Toshiba P505-ST5800 laptop over.
2. Find the laptop battery release button lock for your Toshiba P505-ST5800 laptop.
3. Now that your Toshiba P505-ST5800 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 P505-ST5800 battery is removed, grab your replacement Toshiba P505-ST5800 battery for installation.
6. Insert the battery into the slot. Push the Toshiba P505-ST5800 battery towards the laptop and secure it in place.