Need a battery for Dell Laptops/Notebooks with the following model numbers: Inspiron 13R, 14R, 15R, 17R (9-cells)? BTI has you covered with our premium 9 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original Dell part numbers 312-0234, 4T7JN, 9T48V, 0YXVK2. All BTI batteries are manufactured and tested under our stringent quality standards and come with an industry leading 18 month manufacturer's warranty. BTI.. True to the Original.