NOTE:The Battery is A1321 ,only for macbook pro 15 inch A1286 Mid 2009 Mid 2010 Version ! Not fit for A1286 ealy 2011 late 2011 mid 2012 Model:A1382
Compatible with Part Number :
A1321 31CP5/81-77-2 661-5211 661-5476 020-6766-B 020-6380-A
MB986*/A / MB986CH/A / MB986J/A / MB986TA/A / MB986X/A / MB986ZP/A (only for Mid 2009 Mid 2010 Version) MB985 / MB985CH/A / MB985*/A / MB985CH/A / MB985J/A / MB985TA/A / MB985X/A / MB985ZP/A MC118 / MC118*/A / MC118CH/A / MC118J/A / MC118TA/A / MC118X/A / MC118ZP/A
Compatible with Macbook Pro Laptop Models:
MacBook Pro 15.4" inch Mid 2009 version:
MacBook Pro 15.4" 2.53GHz Core 2 Duo (MC118LL/A, A1286, MacBookPro5,4) - Mid 2009
MacBook Pro 15.4" 2.66GHz Core 2 Duo (MB985LL/A, A1286, MacBookPro5,3) - Mid 2009
MacBook Pro 15.4" 2.8GHz Core 2 Duo (MB986LL/A, A1286, MacBookPro5,3) - Mid 2009
MacBook Pro 15.4" 3.06GHz Core 2 Duo (MB986LL/A, A1286, MacBookPro5,3) - Mid 2009
MacBook Pro 15.4" inch Mid 2010 version:
MacBook Pro 15.4" 2.4GHz Core i5 (MC371LL/A, A1286, MacBookPro6,2) - Mid 2010
MacBook Pro 15.4" 2.53GHz Core i5 (MC372LL/A, A1286, MacBookPro6,2) - Mid 2010
MacBook Pro 15.4" 2.66GHz Core i7 (MC373LL/A, A1286, MacBookPro6,2) - Mid 2010
MacBook Pro 15.4" 2.8GHz Core i7 (MC373LL/A, A1286, MacBookPro6,2) - Mid 2010
How to install a new battery?
1, You need to turn off your laptop and disconnect the power.
2, Disconnect the connection between the old battery and the motherboard to avoid unnecessary damage caused by disassembling the battery. Then unscrew the old battery screws one by one and carefully save each screw.
3, Remove the old battery, carefully install the new battery on the battery case, screw in the screw, and connect the wiring of the new battery.
4, If you don't understand the above steps, you can search for the video about laptop battery installation on YouTube. Maybe it will help you