Toshiba Lithium-ion lets you use your laptop anywhere Enhanced battery life helps you stay connected 9-cell rechargeable, removable battery pack works with several Toshiba laptops Rechargeable battery weighs just 1.1 pounds Compatible with: M10 M15 Tecra M1 Capacity: 10.8V x 6600 mAh Average Run Time: 5.1 hours at full load Recharge time: 2.8 hours