Go to Amazon Sites : br br TechOrbits Laptop Battery for Apple A1322 A1278 (2009 Version) Unibody MacBook Pro 13'' fits br br Battery type Li-Polymer Capacity 5200mAh Cells 6-cell Voltage 111V br 100 New from Manufacturer Up to 500 recharge cycles over the life of the battery TechOrbits is the only laptop battery brand to offer a 3 year warranty br CE-FCC-RoHS-Certified for safety 2 hour email response time 247 the friendliest support on the planet br Texas Instruments main board inside for fast chargingdouble overcircuit protection for extra safety br Operation time standard 4400mAh batteries provide about 2 hours of operation time the actual operation time will depend on hardwaresoftware being run as well as power management settings and the laptops energy efficiency