well First off i read most of your Post, but I'm really tired so I jus figured I'd Reply 2 some stuff I have an Answer 2. about Powering the XBOX, u could get a Power inverter thing that just connects Directly 2 the Car Battery, also looks more Pro. an about Wearing down the Battery, well look around you vehicle an see if you have room somewhere 2 stash away a new Battery, an maybe run off that, but then I guess it's not charging from the alternator then eh? maybe look into a new Alternator 2 put out the lil more juice that the XBOX will use up, that could solve the problem, u would need 2 talk 2 a dealership about doing that an getting the right 1 for you vehicle. also I read that the HDD won't take Kindly 2 the Bumpy Ride, but I don't know why or how, or even how 2 protect it, I'm new 2 the XBOX mod Scene so I can't help u out with all ur problems yet.