ThinkPad T Series notebooks are Lenovo's Enterprise Best Choice, offering a thin and light design with no-compromise performance. They can stay unplugged up to 13 hours and still deliver the performance you need. Lenovo's Power Manager, less power-hungry displays, and the latest battery technology let you work wherever, whenever you need, while Lenovo Battery Stretch lets you temporarily extend battery life. In fact, your T Series will retain a charge for more than 30 days when in standby mode.T Series laptops are all business, too. They are designed to pass eight, rugged military-spec tests against extreme environmental variables, including temperature, pressure, dust, humidity, and vibration testing. T Series laptops are more than tough enough to endure the rigors of business travel.