Nokia has released a product advisory for its BL-5C battery saying that "in very rare cases the Nokia-branded BL-5C batteries subject to the product advisory could potentially experience overheating initiated by a short circuit while charging, causing the battery to dislodge"

And if you think it's a small problem, think again.

Nokia's press release continues "This advisory applies only to the 46 million batteries manufactured by Matsushita between December 2005 and November 2006" - only 46 million potential problems then.

So how do you know if your phone's battery is affected? First, turn your phone off, remove the battery and check whether it is the BL-5C, then head to Nokia's site where you can see which phones are affected. If your phone is in the list, enter the ID number found at the bottom of the rear of the battery.

Interestingly, the ID check doesn't appear to know whether you've entered a valid ID number - so as long as you enter 26 characters it will assume you've typed in the ID correctly. Since it's incredibly easy to accidentally enter a wrong character, surely Nokia should ensure any entered ID is actually a valid one.

As it stands, if you enter any random 26 characters you'll simply be told your battery is not affected - which is a bit of a concern. As anyone who has installed the likes of Windows Vista or XP will know, the chances of inputting a single wrong character in a 26 character string is pretty high.