1. Turn your Dell PP28L laptop over.
2. Find the laptop battery release button lock for your Dell PP28L laptop.
3. Now that your Dell PP28L 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 Dell PP28L battery is removed, grab your replacement Dell PP28L battery for installation.
6. Insert the battery into the slot. Push the Dell PP28L battery towards the laptop and secure it in place.