1. Turn your Apple MB133B laptop over.
2. Find the laptop battery release button lock for your Apple MB133B laptop.
3. Now that your Apple MB133B 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 Apple MB133B battery is removed, grab your replacement Apple MB133B battery for installation.
6. Insert the battery into the slot. Push the Apple MB133B battery towards the laptop and secure it in place.