This follows major battery recalls from Dell and Apple, as well as a smaller recall by Toshiba. In all these cases, the batteries in question were manufactured by Sony.
Here's a list of affected systems, taken from the Lenovo press release. Full details on how to replace a bad battery are available at the company's Web site.
IBM and Lenovo sold these Sony batteries in systems listed below between February 2005 and September 2006. Customers who bought one of the following systems may have a battery subject to this recall:
ThinkPad R Series (R51e, R52, R60, R60e) ThinkPad T Series (T43, T43p, T60) ThinkPad X Series (X60, X60s)