V7s high quality replacement notebook batteries are made from the highest quality cells available & incorporate all of the standard logic boards, thermal protectors, thermistors & circuit breakers to ensure maximum levels of safety, reliability & efficiency. V7s wide selection is compatible with top line products from all major manufacturers & meets or exceeds the original OEM specifications to provide longer-lasting quality & no memory effect. Features Technology: Li-Ion Voltage: 11.1 Cells: 6 Capacity: 5200m Ah Compatible with: Lenovo Think Pad R61, R61i, T61, R400, T400 (14W, 14.1" Widescreen only) Replacement OEM Battery part numbers 41U3198, 42T4549, 42T4548, 42T4653, 42T5262, 42T4264, 42T5265, L3A6316, R8FKF186