Amstron provides reliable, high performance replacement batteries for your Panasonic laptops. The LPA-14 is designed to be 100% manufacturer compatible with Panasonic OEM part numbers CF-VZSU27A, CF-VZSU27AU, CF-VZSU27AU-EC and CF-VZSU27UR. Amstron Lithium-Ion batteries provide superior performance and reliability. The CF-VZSU27A replacement Panasonic battery is rigorously tested for productivity and compatibility with the Toughbook W2 and Toughbook Y2 notebook models. Amstron brand batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility and safety to exceed original equipment manufacturer specifications.