1. Turn your Acer 5820G laptop over.
2. Find the laptop battery release button lock for your Acer 5820G laptop.
3. Now that your Acer 5820G 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 5820G battery is removed, grab your replacement Acer 5820G battery for installation.
6. Insert the battery into the slot. Push the Acer 5820G battery towards the laptop and secure it in place.