MacBook Pro 15" Unibody Late 2008 and Early 2009 Battery Replacement - iFixit Repair Guide
MacBook Pro Upgrade Guide
Review Apple MacBook Pro 15 Mid 2009 2.8 GHz - NotebookCheck.net Reviews
11.1V A1322 Battery for MacBook Pro 13 Unibody - A1278 - Mid 2009 / Mid 2010 / Early 2011 / Late 2011 / Mid2012
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NewerTech NuPower Battery for MacBook Pro 15", NWTBAP15MBU54RS
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MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery - iFixit
Apple's 2009 MacBook Pro: Battery Life to Die For
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Amazon.com: A1321 Battery for Apple MacBook Pro 15" inch A1286 (Only for Mid 2009, Early/Late 2010), fits MC118LL/A MC373LL/A MB986LL/A Series Notebook : Electronics