1. Turn your Toshiba PSK3BU laptop over.
2. Find the laptop battery release button lock for your Toshiba PSK3BU laptop.
3. Now that your Toshiba PSK3BU 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 PSK3BU battery is removed, grab your replacement Toshiba PSK3BU battery for installation.
6. Insert the battery into the slot. Push the Toshiba PSK3BU battery towards the laptop and secure it in place.