Product Advisory: Nokia BL-5C battery
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.
If you have a Nokia BL-5C battery you can check it here:
http://www.nokia.com/batteryreplacement/en/