1. Turn your Samsung R520 laptop over.
2. Find the laptop battery release button lock for your Samsung R520 laptop.
3. Now that your Samsung R520 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 Samsung R520 battery is removed, grab your replacement Samsung R520 battery for installation.
6. Insert the battery into the slot. Push the Samsung R520 battery towards the laptop and secure it in place.