This 9 Cell 7200mAh Ultra High Capacity battery is exclusively designed for the Lenovo IBM ThinkPad R61 R61i T61 T61p R400 T400 Series(14.1" Widescreen). Compatible Part Numbers: 42T5225, 42T5227, 42T5229, 42T5262, 42T5264, 41U3197, 42T5263, 42T5230, 43R2499, 42T4530, 42T4645. It lets you take your computing with you at home, office, on the move or at school. We guarantee our products will exceed expectations and deliver the best product quality performance. All of our batteries comply with ROHS and CE quality testing standards. We have liability insurance coverage for any product damages up to $3,000,000 USD so you will feel at ease with buying from us. We understand the annoyances of dealing with defective products, thus we make sure to offer only the best products available. Buy with Confidence!