Key Power Laptop Battery for A1331 A1342 Unibody MacBook 13.3-Inch (Apple MacBook Late 2009 Mid 2010), fits 661-5391 661-5585 MC207LL/A MC516LL/A - 18 Month Warranty [Li-Polymer 6-cell 6000mAh/65Wh] Battery type: Li-Polymer; Capacity: 6000mAh/65Wh; Cells: 6-cell; Voltage: 10.95V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. 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. Battery operation time: approximately 2 hour 15 minutes. Actual operation time will depend on how much electricity is required by the device and how you use it.