Never worry about running out of battery power with this Winbook XL series replacement battery by Amstron. With a capacity of 8800mAh, this high capacity battery will work seamlessly when you are on the move. The LWI-11 is precision-engineered and rigorously tested to be 100% compatible with the Twinhead Slimnote XL, Winbook XL and Winbook XLi laptops. Take your work on the road with you without sacrificing performance and productivity with Amstron brand Toshiba laptop batteries. • 10.8V 4050mAh • Lithium Ion Replacment • 100% original manufacturer compatible • Guaranteed to meet or exceed original specifications • Highest quality Japanese battery cells • Full 1 year warranty • The LWI-11 battery is not compatible to WinBook XL2/XL3 Series. The LWI-13 is the correct battery for the WinBook XL2/XL3 Series. Please see SKU: LWI-13