High performance, lightweight replacement battery for Lenovo IBM ThinkPad R61 R61i T61 T61p R400 T400 Series(14.1" Widescreen). Compatible with Lenovo/IBM part # 42T5225, 42T5227, 42T5229, 42T5262, 42T5264, 41U3197, 42T5263, 42T5230, 43R2499, 42T4530, 42T4645. Our batteries are in high grade quality and certified by CE and RoHS. Any battery you purchase from us is guaranteed: 100% Original Manufacturer Compatible! Guaranteed to Meet or Exceed Original Specifications! Full 1 Year Warranty! We also have liability insurance coverage for any product damages up to $3,000,000 USD, so you can have completed confidence on our products and rest assured to purchase with us!