Need a battery for Lenovo-IBM Laptops/Notebooks with the following model numbers: R61, R61i, T61, R400, T400 (14W, 14.1 Widescreen only)? 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 Lenovo-IBM part numbers U3-130, 28-390, BQC-PGM10X//1, L129, LA300, LCA3113, LCA3119, LMP-M130, LT50LP, LT51LP, U3-130, VLT-X30LP, VLT-XD20LP. 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.