1. Turn your HP ze5620US laptop over.
2. Find the laptop battery release button lock for your HP ze5620US laptop.
3. Now that your HP ze5620US 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 ze5620US battery is removed, grab your replacement HP ze5620US battery for installation.
6. Insert the battery into the slot. Push the HP ze5620US battery towards the laptop and secure it in place.