Apple is now shipping replacement iPod nanos to customers who had Nanos from a certain batch in the first-generation production run that have been shown to have defective batteries that could, in rare circumstances, overheat or even catch fire. The new units are exactly the same as the replacements, and not brand new iPod nanos (which now hold 8GB or 16GB) as some had hoped. The original Nanos came in 1, 2 or 4GB capacities.
