Lazada Laptop Replacement Battery for Apple A1382 A1286 (For Core i7 Early 2011 Late 2011 Mid 2012) Unibody Macbook Pro 15", also fit 661-5844 MC721LL/A [Li-Polymer 6-cell 73Wh] 100% new from manufacturer, up to 500 recharge cycles over the life of the battery. Battery type:Li-polymer;Cells:6;Capacity:6600mAh/73Wh;Voltage:10.95V. Safe guarantee:CE-/FCC-/RoHS-Certified for safety. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: Over 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.