Nokia has officially admitted that BL-5C batteries are unsafe. Nokia has for the first time came out officially saying that BL-5C batteries manufactured by Matsushita Battery Industrial Co. Ltd. of Japan may be unsafe. There are around 300 million batteries of this model already in market.
Nokia has advised the customers to check for battery issue at the website http://nokia.com/batteryreplacement
Incase, if you are in India, please dial up the number below to get in touch with the Nokia care desk (30303838 )
I gotta check mine too 😉