Tracker cards, the ultra-thin, credit card-size cards people put in their wallets and the like, are becoming more popular. They’re handy if you lose a belonging or it's stolen. But does the small lithium battery contained within present a risk? Tech reporter Adrian Kingsley-Hughes tortured hers to find out and presents her findings in this article for @ZDNet: https://flip.it/bZc0.a #Tech #Technology #Security