1. Turn your HP 1218ca laptop over.
2. Find the laptop battery release button lock for your HP 1218ca laptop.
3. Now that your HP 1218ca 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 1218ca battery is removed, grab your replacement HP 1218ca battery for installation.
6. Insert the battery into the slot. Push the HP 1218ca battery towards the laptop and secure it in place.