TechFuel 42T4511 Battery for Lenovo ThinkPad T500 R500 W500 R60 R61i T60 T61 (Std Screen) Laptops - Professional 9-cell, 72Wh 10.8V Li-ion Battery Extended Capacity Rechargeable Battery - Voltage: 10.8V; Capacity: 6600mAh/71Wh; Cells: 9-cell; Battery Type: Li-ion. Extended Capacity batteries are larger, heavier and will protrude from the bottom of your laptop. Please check Product Details for dimensions. Brand new battery constructed with advanced circuit board technology, including built-in thermal circuit protection for safety and stability. Grade-A cells for faster charging and more efficient power consumption. Precision construction for optimal fit; CE and RoHS certification ensures quality, safety and peace-of-mind. Up to 500 charge cycles over the life of the battery. Friendly and knowledgeable Customer Support Staff available by email or toll-free telephone. No risk 30-day money back guarantee; 1-year full replacement warranty. Built with quality components and rigorous quality control. Operating time will vary depending upon computer settings, hardware use, etc. Generally, for every 2000mAh, the battery will yield approximately 1 hour of run time.