1. Turn your Toshiba A300-20V laptop over.
2. Find the laptop battery release button lock for your Toshiba A300-20V laptop.
3. Now that your Toshiba A300-20V 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 A300-20V battery is removed, grab your replacement Toshiba A300-20V battery for installation.
6. Insert the battery into the slot. Push the Toshiba A300-20V battery towards the laptop and secure it in place.