1. Turn your Toshiba P300-28L laptop over.
2. Find the laptop battery release button lock for your Toshiba P300-28L laptop.
3. Now that your Toshiba P300-28L 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 P300-28L battery is removed, grab your replacement Toshiba P300-28L battery for installation.
6. Insert the battery into the slot. Push the Toshiba P300-28L battery towards the laptop and secure it in place.