TechOrbits Laptop Battery for Toshiba PA3817U-1BRS PA3819U-1BRS Toshiba Satellite C655 L600 L675 L675D L700 L745 L750 L750D L755 L755D M640 M645 P745 Series - 3 Years Warranty Battery type: Li-ion; Capacity: 4400mAh; Cells: 6-cell; Voltage: 10.8V 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 laptop's energy efficiency