1. Turn your HP RE131PA laptop over.
2. Find the laptop battery release button lock for your HP RE131PA laptop.
3. Now that your HP RE131PA 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 RE131PA battery is removed, grab your replacement HP RE131PA battery for installation.
6. Insert the battery into the slot. Push the HP RE131PA battery towards the laptop and secure it in place.