Ok, this question might be a little out there and probably common sense but I just need to clarify it. Since my sister is moving across country to the west coast, she purchased a new portable 10 inch DVD player for $80 bucks from Target on Black Friday. She's also planning on buying a MacBook to serve her computing needs. When she was about to open the DVD player.. I stopped her quickly saying she can watch DVD movies on her future MacBook. My dad and sister then said it's better to watch DVD's on a DVD player and keep the MacBook to it's own needs. Which I agree too but in my opinion both will experience battery life depletion in some way over time but the one thing that got me stumbled was this; "while watching DVD's on the MacBook, will it kill the battery faster than usual usage or is it all the same". This goes for plugged in or not and not battery life but the health of it. If this post doesn't make sense, I apologize.. I'll try to clear it up if anything. Thanks for your help!