Nokia is replacing problematic BL-5C batteries that are made by a specific manufacturer and made at a certain date. Please check the link below to get instructions on how to check your battery if it needs to be replaced. It also has a serial number checker to see if it is specifically one of those that they need to replace. http://batteryreplacement.nokia.com/batteryreplacement/en/ Sadly, 2 of my phones use that battery and one needs to be replaced.