Oh dear another battery manufacture has problems this time its not Sony and only 46 Million batteries this time....

http://www.nokia.com/batteryreplacement/en/

Nokia has identified that in very rare cases the affected batteries could potentially experience over heating initiated by a short circuit while charging, causing the battery to dislodge. Nokia is working closely with relevant local authorities to investigate this situation.

Nokia has several suppliers for BL-5C batteries that have collectively produced more than 300 million BL-5C batteries. This advisory applies only to the 46 million batteries manufactured by Matsushita between December 2005 and November 2006. There have been approximately 100 incidents of over heating reported globally.