1. Turn your Acer 3620 laptop over.
2. Find the laptop battery release button lock for your Acer 3620 laptop.
3. Now that your Acer 3620 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 3620 battery is removed, grab your replacement Acer 3620 battery for installation.
6. Insert the battery into the slot. Push the Acer 3620 battery towards the laptop and secure it in place.