Nokia's fessed up to the fact that "a limited number" BP-6M batteries used in the N73 have, over time, swollen up -- apparently in some cases to about three-times their original size. The worst of these cases have resulted in handsets with a battery cover that won't close at the back -- rendering the phone totally not cool. It's a fairly common lithium-ion battery occurence after a few years, but don't worry -- it's not dangerous, just annoying. Look at this this way: at least the batteries aren't exploding.Filed under: Cellphones