LB1 High Performance Battery for Apple MC373/A MC373B/A [Mid 2009 to Mid 2010] Macbook Pro 15 inch Unibody Battery Type: Li-Polymer; Capacity: 5700mAh/63Wh; Cells: 9-Cells; Voltage: 10.95V Premium Grade A cells ensures peak performance and reliability. Operation time depends on the capacity of the battery, laptop settings, power consumption of equipment, and how you use it. CE-/RoHS-/FCC- Certified and Built-in circuit protection ensure both safety and stability. Live Support Mon-Fri 4am-8pm PST | Sat-Sun 8am-5pm PST | 18 Months Hassle-Free Warranty. Compatible with: Apple MC373/A MC373B/A [Mid 2009 to Mid 2010] Macbook Pro 15 inch Unibody