CSEXCEL Laptop Battery for Apple Macbook Air 11 Inch A1375 A1370 (2010) 661-5736 020-6920-A 020-6920-B MC505 MC506 MC505LL/A MC506LL/A MC507LL/A - 12 Months Warranty Compatible with Apple MacBook MacBook Air 11 Inch A1375, A1370 (Late 2010 Version) High-Capacity: 5200mAh Battery Voltage: 7.3V Battery Cell: Li-Polymer For your macbook to provide the perfect endurance and 12-month warranty Please confirm that your laptop's model number, the original A1375 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