This is the Toshiba PA3635 battery, compatible with the Toshiba Portege M800, Equium and Satellite models. Our replacement laptop batteries are manufactured to OEM specifications and will perform identically to the factory originals. If you dont want to worry about running out of power on a long flight or when away from the office, purchase a spare battery. High capacity Toshiba M800 batteries from USBPhoneWorld.com have 9-cell lithium-ion construction and are rated at 10.8V with 7200mAh capacity. To maximize the battery run time, close any applications youre not using and dont leave any CDs or DVDs in an internal drive when theyre not in operation. We offer this PA3635 battery at a low price, making it a great value. When you purchase a Toshiba M800 battery from us, youll be able to take advantage of our first-class customer service. Contact us if you have any questions about operation or compatibility.