1. Turn your HP CQ57-339WM laptop over.
2. Find the laptop battery release button lock for your HP CQ57-339WM laptop.
3. Now that your HP CQ57-339WM 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 CQ57-339WM battery is removed, grab your replacement HP CQ57-339WM battery for installation.
6. Insert the battery into the slot. Push the HP CQ57-339WM battery towards the laptop and secure it in place.