1. Turn your Acer 2102 laptop over.
2. Find the laptop battery release button lock for your Acer 2102 laptop.
3. Now that your Acer 2102 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 2102 battery is removed, grab your replacement Acer 2102 battery for installation.
6. Insert the battery into the slot. Push the Acer 2102 battery towards the laptop and secure it in place.