CSE&reg; High Performance Laptop Battery for Apple Macbook 11-Inch A1406 A1370 (2011 Version) 020-7376-A 020-7377-A MC968 MC969 - 18 Months Warranty [Li-Polymer 7.3V 35Wh] Compatible with Apple Macbook Air 11 inch A1406 A1370 A1406 A1495 2011 2012 2013 2014 version , Fit Macbook Air 11 MC968 MC965 MC506LL MC969LL High-Capacity: 4600mA Battery Voltage: 7.3V Battery Cell: Li-Polymer For your macbook to provide the perfect endurance and 18-month warranty Please confirm that your laptop's model number, the original A1406 battery's part number and your laptop's version correctly match this replacement battery. You can access this information on your computer by: About this Mac --&gt;More info... --&gt;Serial number--&gt;Check your laptop's version on Apple's offical website or Google the serial number