USB Phone World’s inventory of replacement batteries for IBM Lenovo ThinkPad T40, T41, T41P and T42 laptop computers have been manufactured using the latest technology making them better than the original batteries. These new lithium ion batteries have more powerful cells, anodes, cathodes and control circuits than the original batteries which guarantees that these batteries will perform better than the original batteries. If you are searching for the most powerful battery for an IBM T42, you have visited the right site. At USB Phone World, you can purchase original OEM versions of the T40, T41 and T42 batteries which are six-cell units, or you can select high-capacity nine-cell batteries for these machines. Whichever size you choose, you can be assured that you are getting a very high quality battery at a great price.