1. Turn your Acer 1820PTZ laptop over.
2. Find the laptop battery release button lock for your Acer 1820PTZ laptop.
3. Now that your Acer 1820PTZ 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 Acer 1820PTZ battery is removed, grab your replacement Acer 1820PTZ battery for installation.
6. Insert the battery into the slot. Push the Acer 1820PTZ battery towards the laptop and secure it in place.