1. Turn your Acer 3811TZG laptop over.
2. Find the laptop battery release button lock for your Acer 3811TZG laptop.
3. Now that your Acer 3811TZG 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 3811TZG battery is removed, grab your replacement Acer 3811TZG battery for installation.
6. Insert the battery into the slot. Push the Acer 3811TZG battery towards the laptop and secure it in place.