So, in addition to worrying about what happens to your e-money and train pass if your new DoCoMo FeliCa smartcard handset should fall into the wrong hands, another thing that may have occurred to you is the potentially dire implications of having your battery die just before you suavely swipe your way past the cash register after that sushi dinner. Well, fear not: Sony has been kind enough to hold a PR event to tell us, among other things, that RFID chip in the phone still works even if the power is off. What happens if you run out of e-money? We'll get back to you on that one. This has been a public service announcement.