Power an Alienware Alpha with a battery?
Hello. I was looking at building my own "gaming laptop" by putting an Alienware Alpha (i3 edition http://www.amazon.com/dp/B00MA7AF74/ref=twister_B00PW1Z7TQ?_encoding=UTF8&psc=1) in a briefcase with a screen. Is there any way I can power these two items with a battery? Any help would be appreciated. Thank you.