Best Buy: Apple MacBook Pro 13.3" Intel Core i5 4GB RAM 320GB Hard Drive (MC700LL/A) Early 2011 (Certified Refurbished) Silver A1278
MacBook Pro MC700LL/A Apple Core i5 2.3 GHz Specs (Early 2011 13", MacBookPro8,1 - A1278 (EMC 2419)) - Techable
Battery Life - The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
Apple 15-inch MacBook Pro (Late 2011) Review
The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
Apple MacBook Pro 13 inch Series - Notebookcheck.net External Reviews
Would the battery from a 13" MacBook Pro (2010) work in a 15" MacBook Pro 2011? - Ask Different
The Display: Better than Most, Not as Good as the Pro - The 2011 MacBook Air (11 & 13-inch): Thoroughly Reviewed
How Long Does Your MacBook Pro Battery Last? | OSXDaily
MacBook Air (11-inch, Mid 2011) - Technical Specifications
Battery Life - The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
Apple MacBook Pro 13 (Early 2011) review: Apple MacBook Pro 13 (Early 2011) - CNET
Replacement Battery for MacBook Pro 15-inch (2011-2012)
Battery Life - The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
MacBook Pro 13" A1322 battery for Apple A1278 (2009-2012)
A1322 Battery for Apple Macbook Pro 13 inch A1278 Mid 2012 2010 2009 Early 2011 | eBay
MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery - iFixit
Amazon.com: A1322 Battery for A1278 Apple MacBook pro 13 inch Mid 2012 Early 2011 Late 2011 Mid 2010 2009 with 6000mAh Newer Tech (MC374LL/A MB990LL/A MB991LL/A MC700LL/A MD313LL/A MD101LL/A MD102LL/A Battery) :
The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge