Lenovo is forced to recall notebook batteries because of of an overheating problem. This time, it's Sanyo batteries that are causing the problem. Around 100,000 ThinkPad laptops are affected.

There is a page where you see if your laptop is subject to this recall.
www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=BATT-LENOVO