1. Turn your Acer 5810PG laptop over.
2. Find the laptop battery release button lock for your Acer 5810PG laptop.
3. Now that your Acer 5810PG 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 5810PG battery is removed, grab your replacement Acer 5810PG battery for installation.
6. Insert the battery into the slot. Push the Acer 5810PG battery towards the laptop and secure it in place.