1. Turn your HP DV2899ea laptop over.
2. Find the laptop battery release button lock for your HP DV2899ea laptop.
3. Now that your HP DV2899ea 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 DV2899ea battery is removed, grab your replacement HP DV2899ea battery for installation.
6. Insert the battery into the slot. Push the HP DV2899ea battery towards the laptop and secure it in place.