Toshiba Tecra 900/Portege 4000 Series Batterymfg part number: PA3176U-1BRSThis Toshiba Primary Battery Pack is a 6-cell, rechargeable, removable, enhanced capacity Lithium Ion battery designed to work with Toshiba Portege 4000, 4010, M100 and Tecra 9000 or 9100 series portable computers. Always on the road? Add extended power capabilities to your portable computer with an additional battery pack now.Specifications: Capacity: 10.8V x 3600 mAh Number of battery cells: 6 Dimensions: 2.8" x 5.0" x 0.8" Weight: 0.73 lbs Battery life*: 3.9 Hours ~ 4.43 Hours (varied by model of notebook used with) Recharge time: 2.5 hours Compatible with Toshiba Portege 4000, 4010, M100 and Tecra 9000, 9100 series portable computers Manufacturer warranty