NewerTech® : Batteries : NuPower® Battery for MacBook Pro 17" Unibody Early 2009, Late 2009, & Mid 2010 Models
Gomarty A1321 Laptop Battery for MacBook Pro 15 inch A1286 (Only for Mid 2009, Early/Late 2010) MB985 MB986J/A MC118LL/A MC373LL/A MB986LL/A MC721LL/A MC723LL/A 661-5844 020-7134-A - Newegg.com
Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
Amazon.com: LQM® 7.3V 95Wh New Laptop Battery for Apple MacBook Pro 17" A1309 A1297 (2009 Version Early 2009 Mid-2009 Mid-2010),Compatible MC226*/A MC226CH/A MC226J/A 020-6313-C 661-5037-A : Electronics
How to Replace the Battery in a 13-inch MacBook Pro (Mid 2009) MacBookPro5,5 - YouTube