1. Turn your Toshiba A300D-15B laptop over.
2. Find the laptop battery release button lock for your Toshiba A300D-15B laptop.
3. Now that your Toshiba A300D-15B 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 A300D-15B battery is removed, grab your replacement Toshiba A300D-15B battery for installation.
6. Insert the battery into the slot. Push the Toshiba A300D-15B battery towards the laptop and secure it in place.