1. Turn your Dell 1420 laptop over.
2. Find the laptop battery release button lock for your Dell 1420 laptop.
3. Now that your Dell 1420 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 Dell 1420 battery is removed, grab your replacement Dell 1420 battery for installation.
6. Insert the battery into the slot. Push the Dell 1420 battery towards the laptop and secure it in place.