1. Turn your Toshiba PSL43E laptop over.
2. Find the laptop battery release button lock for your Toshiba PSL43E laptop.
3. Now that your Toshiba PSL43E 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 PSL43E battery is removed, grab your replacement Toshiba PSL43E battery for installation.
6. Insert the battery into the slot. Push the Toshiba PSL43E battery towards the laptop and secure it in place.