Runpower Laptop Battery for Apple A1375 A1370 (Only for Late 2010 Version) MacBook Air 11" [Li-Polymer 4-Cell 35Wh/4800mAh] Battery type: Li-Polymer; Capacity: 35Wh/4800mAh; Cells: 4-cell; Voltage: 7.3V Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability Worry-free, products are passed CE-/FCC-/RoHS-Certified for safety; 100% New from Manufacturer.Up to 500 recharge cycles over the life of the battery Battery operation time: approximately 2.5 hour. Actual operation time will depend on how much electricity is required by the device and how you use it Warranty: 12 months free warranty. 24 x 7 professional and efficient email support