BATTERY TYPE: Model name: A1321 ; Battery type: Li-polymer ; Voltage: 10.95V ; Capacity: 77.5Wh ; 6 A+ Cells. With Three Free Screwdrivers. 100% Brand New. If you are not sure about the model, please contact the CUSTOMER SERVICE through the 'Ask a question' window on the right corner of the store page. Response will be reached in 24h. REPLACEMENT P/N: A1321 020-6380-A 020-6766-B 020-7134-A 661-5211 661-5476 661-5844. COMPATIBLE MODELS: MacBook Pro 15.4' inch Mid 2009 version: MC118LL/A, A1286, MacBookPro5,4; MB985LL/A, A1286, MacBookPro5,3; MB986LL/A, A1286, MacBookPro5,3; MB986LL/A, A1286, MacBookPro5,3. MacBook Pro 15.4' inch Mid 2010 version: MC371LL/A, A1286, MacBookPro6,2; MC372LL/A, A1286, MacBookPro6,2; MC373LL/A, A1286, MacBookPro6,2; MC373LL/A, A1286, MacBookPro6,2.