This is a high-performance replacement laptop battery for the Lenovo ThinkPad T61 (14.1 standard screens and 15.4 widescreen), guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 8.06 x 2.31 x 0.81 inches with an output of 10.8 volts. The chemistry is Li-Ion at 4400mAH capacity. Manufactured by Empire Scientific, model number LTLI-9064-4.4. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.