1. Turn your HP tx2550ei laptop over.
2. Find the laptop battery release button lock for your HP tx2550ei laptop.
3. Now that your HP tx2550ei 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 tx2550ei battery is removed, grab your replacement HP tx2550ei battery for installation.
6. Insert the battery into the slot. Push the HP tx2550ei battery towards the laptop and secure it in place.