1. Turn your HP zt3350ea laptop over.
2. Find the laptop battery release button lock for your HP zt3350ea laptop.
3. Now that your HP zt3350ea 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 HP zt3350ea battery is removed, grab your replacement HP zt3350ea battery for installation.
6. Insert the battery into the slot. Push the HP zt3350ea battery towards the laptop and secure it in place.