This IBM 42T4552 battery is compatible with the 14-inch widescreen version of Lenovo ThinkPad T60, T61, R60, R61, T400 and R400 laptops. Additional compatible Lenovo models and battery part numbers are listed below. This IBM 42T4552 battery replaces the Lenovo ThinkPad T61 and IBM ThinkPad R61 14.1" widescreen series. Including type 7732, 7733, 7734, 7735, 7736, 7737, 7738, 7742, 7743, 7744, 7751, 7753, 7754, and 7755 series models. Note: This 42T4552 battery is made specifically for the 14-inch widescreen version of this laptop and is not compatible with the standard screen size. Replaces these Lenovo battery part numbers: 41U3196, 41U3197, 41U3198, 42T4528, 42T4529, 42T4530, 42T4531, 42T4533, 42T4546, 42T4547, 42T4548, 42T4549, 42T4552, 42T4554, 42T4555, 42T4668, 42T4677, 42T4743, 42T4744, 42T5225, 42T5226, 42T5227, 42T5228, 42T5229, 42T5230, 42T5232, 42T5255, 42T5262, 42T5263, 42T5264, 42T5265, 43R2499, 45J7969, Battery 33, Battery 33+ What's in the box 1 X Battery