^ a b c "Apple Introduces 17-inch MacBook Pro With Revolutionary New Built-in Battery That Delivers Eight Hours of Use & 1,000 Recharges" . Apple . January 6, 2009 . http://www.apple.com/pr/library/2009/01/06mbp.html . Retrieved April 11, 2010 .   ^ a b Ackerman, Dan (June 8, 2009). "New Apple MacBooks demystified"