1. Turn your HP dv6266eu laptop over.
2. Find the laptop battery release button lock for your HP dv6266eu laptop.
3. Now that your HP dv6266eu 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 dv6266eu battery is removed, grab your replacement HP dv6266eu battery for installation.
6. Insert the battery into the slot. Push the HP dv6266eu battery towards the laptop and secure it in place.