The Japanese Ministry of Economy, Trade and Industry (METI) has said Apple has satisfied its requirements for more improved safety warnings related to overheating first-generation iPod nano units, Reuters reports. Earlier this month, the Ministry ordered Apple to post an “easy to understand” statement on its website explaining how first-generation iPod nano owners could receive a replacement battery. Apple went a step farther, launching a replacement program for potentially troublesome units. “We’ve worked closely with METI to make sure first-generation iPod nano customers who are concerned with their battery have the latest information,” said U.S.-based Apple spokesman Tom Neumayr. Roughly 60 cases of overheating nanos have been reported in Japan, including four cases of minor burns.