1. Turn your HP dv8-1090ef laptop over.
2. Find the laptop battery release button lock for your HP dv8-1090ef laptop.
3. Now that your HP dv8-1090ef 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 dv8-1090ef battery is removed, grab your replacement HP dv8-1090ef battery for installation.
6. Insert the battery into the slot. Push the HP dv8-1090ef battery towards the laptop and secure it in place.