TechOrbits Notebook Laptop 9-cells High Capacity 6600mAh Battery for Panasonic Toughbook 52 CF-52 CF-VZSU29AS Series-3 years Warranty Battery type: Li-ion; Capacity: 6600mAh; Cells: 9-cell; Voltage: 11.1V. 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 CE-/FCC-/RoHS-Certified for safety; 2 hour email response time 24/7; the friendliest support on the planet Texas Instruments main board inside for fast charging;double overcircuit protection for extra safety Operation time: standard 4400mAh batteries provide about 2 hours of operation time; the actual operation time will depend on hardware/software being run as well as power management settings and the laptops energy efficiency