Tonight on my flight out of sha the luggage scanner needed immediately after my bag entered it and I was sent to the inspection room (a routine I'm used to in Japan but not in China). There were three other people there was well). In each case the contraband was li batteries). I actually had a tiny Nokia with a battery inside and an identical spare. They were cool with the former but insisted that the lone battery travel with me in the passenger cabin. One of the other passengers also had her computer charger in her bag and they wanted her to carry it on but she stood her ground and won.