1. Turn your HP DV2550SE laptop over.
2. Find the laptop battery release button lock for your HP DV2550SE laptop.
3. Now that your HP DV2550SE 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 DV2550SE battery is removed, grab your replacement HP DV2550SE battery for installation.
6. Insert the battery into the slot. Push the HP DV2550SE battery towards the laptop and secure it in place.