narramissic writes "Toshiba Corp. has offered to exchange 340,000 laptop computer batteries made by Sony. According to a Toshiba spokesman, the batteries may fail to charge correctly, causing the power to cut off suddenly. The company will be posting a software tool to its Web site, allowing customers to identify whether their computer is affected." From the article: "Toshiba's problems stem from a defect in the interface circuitry between the battery cells and the computer. That defect is caused by corrosion, said a spokesman for Sony, the manufacturer of the batteries. An ingredient used in the insulating paper of batteries manufactured between March and May can corrode components in the batteries' charging circuits, causing them to fail, said Sony spokesman Takashia Uehara. The supplier changed the composition of the insulating paper without notice, he said."