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Need a battery for Lenovo-IBM Laptops/Notebooks with the following model numbers: ThinkPad T410, T410i, T420, T420i, T510, T520, T520i, W510, W520; L series; SL410, SL420; Edge E40, E50, 14, 15 (6-cells)? BTI has you covered with our premium 6 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original Lenovo-IBM part numbers 42T4790, 42T4791, 42T4794, 42T4795, 57Y4185, Battery 55+. 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.