You will need to follow this guide before making any replacments on your Dell XPS. Unscrewing the back panel is easy and will take you no time. All you need is a phillips screw driver, a torx screw driver and this guide.
Find and remove the two .3cm torx head screws using a T5 screwdriver.
Find and remove the six Phillips head .3cm screws using a Phillips #0 screwdriver.
Unplug the battery indicator.