1. Turn your Compaq R3128RS laptop over.
2. Find the laptop battery release button lock for your Compaq R3128RS laptop.
3. Now that your Compaq R3128RS 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 Compaq R3128RS battery is removed, grab your replacement Compaq R3128RS battery for installation.
6. Insert the battery into the slot. Push the Compaq R3128RS battery towards the laptop and secure it in place.