1. Turn your Toshiba L45-S7423 laptop over.
2. Find the laptop battery release button lock for your Toshiba L45-S7423 laptop.
3. Now that your Toshiba L45-S7423 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 L45-S7423 battery is removed, grab your replacement Toshiba L45-S7423 battery for installation.
6. Insert the battery into the slot. Push the Toshiba L45-S7423 battery towards the laptop and secure it in place.