1. Turn your Acer AS5542G laptop over.
2. Find the laptop battery release button lock for your Acer AS5542G laptop.
3. Now that your Acer AS5542G 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 AS5542G battery is removed, grab your replacement Acer AS5542G battery for installation.
6. Insert the battery into the slot. Push the Acer AS5542G battery towards the laptop and secure it in place.