1. Turn your HP RG339UA laptop over.
2. Find the laptop battery release button lock for your HP RG339UA laptop.
3. Now that your HP RG339UA 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 RG339UA battery is removed, grab your replacement HP RG339UA battery for installation.
6. Insert the battery into the slot. Push the HP RG339UA battery towards the laptop and secure it in place.