1. Turn your Toshiba P300D-20B laptop over.
2. Find the laptop battery release button lock for your Toshiba P300D-20B laptop.
3. Now that your Toshiba P300D-20B 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 P300D-20B battery is removed, grab your replacement Toshiba P300D-20B battery for installation.
6. Insert the battery into the slot. Push the Toshiba P300D-20B battery towards the laptop and secure it in place.