MacBook Pro 15" Unibody Late 2008 and Early 2009 Battery Replacement - iFixit Repair Guide
Other Hardware Changes - Apple's 2009 MacBook Pro: Battery Life to Die For
A1322 Battery Compatible with MacBook Pro 13 inch Battery Replacement A1322 A1278 Battery for MacBook Pro 13 Battery 2009 2010 2011 2012 with Two Screwdrivers 65.5Wh/6000mAh - 12 Months Warranty: Amazon.co.uk: Computers & Accessories
Amazon.com: A1278 A1322 Battery for MacBook Pro 13 inch Mid 2012 2010 2009 Early 2011 Late 2011 A1278 MacBook pro 2012 2011 2010 Battery Replacement 661-5557 661-5229 MB990LL/A MB991LL MC375LL MD314 MC724LL : Electronics
How to Boot MacBook Pro Without a Battery (Older Models 2006 – 2011) | OSXDaily
Apple MacBook Pro 17" A1297 (2009 Version) Battery Replacement
Batteries for MacBook Pro 17" Unibody 2009 - 2010 Models
Amazon.com: SLE-TECH 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