1. Turn your Gateway T-6842 laptop over.
2. Find the laptop battery release button lock for your Gateway T-6842 laptop.
3. Now that your Gateway T-6842 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 Gateway T-6842 battery is removed, grab your replacement Gateway T-6842 battery for installation.
6. Insert the battery into the slot. Push the Gateway T-6842 battery towards the laptop and secure it in place.