There was a wonderfully crafted support document at: 

https://www.dell.com/support/kbdoc/en-au/000178942 that detailed power and battery issues for Alienware laptops, it worked a few weeks ago but now when I visit this KB article I see this message: 

The chosen document is not currently available. Please try again later.

Does anyone know where this particular document might be or why it is currently unavailable?