OMBAR Laptop Battery for Apple A1331 A1342 MacBook 13.3-Inch (Only for Late 2009 Mid 2010) MacBook Air MB985LLA MC118LL A, MacBook Pro MC375LL/A MC374LL/A, Lithium-Polymer Sony Grade A Cell Compatible with Apple MacBook Air 13.3-Inch MacBook Pro 13.3-Inch MacBook Pro 15" series MacBook Pro 17" series Sonny Grade A cell: OMBAR Apple laptop battery cell made from the best cell supplier--Sony. A good battery cell can be stored and released energy steadily for a long time ,the defective is not. So batteries can determine the battery is good or bad. ithium polymer battery is Not Sleazy : Lithium polymer battery electrolyte is a solid or gel rather than a unstable liquid, so more efficient safer.This is an essential difference with Lithium ion electricity Long Life: Up to 500 recharge cycles over the life of the battery , Around 2.5 hours.Actually, depend on the amount of electricity required by the device and how to use, enjoy your travel please High-Capacity: 5000mAh, 55Wh, 10.95V. this battery came to your rescue