1. Turn your Acer E290 laptop over.
2. Find the laptop battery release button lock for your Acer E290 laptop.
3. Now that your Acer E290 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 E290 battery is removed, grab your replacement Acer E290 battery for installation.
6. Insert the battery into the slot. Push the Acer E290 battery towards the laptop and secure it in place.