Battery Indicator Board for Macbook Pro 13" A1278 (Mid 2009-Mid 2012)
Other Hardware Changes - Apple's 2009 MacBook Pro: Battery Life to Die For
MacBook Air 2010 11″ and 13″ Battery Life Better Than Advertised | OSXDaily
Incredible Battery Life Under OS X - Done for 2009: The Holiday MacBook Pro Roundup
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A1322 10.95V/63.5WHLaptop Replacement Battery for MacBook Pro 13'' A13
MacBook Pro Battery Replacement Kits from OWC
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NewerTech® : Batteries : NuPower® Battery for MacBook Pro 13" 2009-Current Models
Mac Battery Replacement - Batteries for MacBook Pro and MacBook Air
Apple MacBook Pro 13" MD101LL-A Battery
Review Apple MacBook Pro 13 Mid 2009 2.53 GHz - NotebookCheck.net Reviews
13 Inch MacBook Pro Replacement Battery A1278 | MacMemory.com
NewerTech NuPower Battery for MacBook Pro 15", NWTBAP15MBU54RS
11.1V A1322 Battery for MacBook Pro 13 Unibody - A1278 - Mid 2009 / Mid 2010 / Early 2011 / Late 2011 / Mid2012
MacBook Pro Upgrade Guide
Apple MacBook Pro 13 inch Series - Notebookcheck.net External Reviews
MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery - iFixit
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NewerTech® : Batteries
Review: Apple's redesigned, late 2009 13-inch MacBook | AppleInsider