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