ThinkPad models. The batteries are apparently causing a range of problems, including bringing up the error messages "irreparable damage" and "battery cannot be charged," and causing overall short capacity batteries, or those than cannot be charged or experience massive drops on the fuel gauge quickly. The recalled models are the R60, R61, T60, T61, X60, and the X61, and Lenovo's got a free diagnostic tool on its website that you can use to check and see if your model is one of those affected. While there's no word on how many users have been affected, If you are one of the unlucky, the company is offering free replacements.
Update: A representative for Lenovo has contacted us and let us know that the company has not, in fact, issued a recall for the batteries associated with the models listed. "This is a service extension program to provide (bonus 12-month) coverage above and beyond the normal warranty to ensure complete customer satisfaction. Recalls tend to imply a safety issue, which is not the case here, as you noted in your article."