1. Turn your Compaq R3005XX laptop over.
2. Find the laptop battery release button lock for your Compaq R3005XX laptop.
3. Now that your Compaq R3005XX 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 R3005XX battery is removed, grab your replacement Compaq R3005XX battery for installation.
6. Insert the battery into the slot. Push the Compaq R3005XX battery towards the laptop and secure it in place.