A macbook battery has a serial number. I didn't know that. From there one can hack a Macbook. <http://www.electronista.com/articles/11/07/22/white.hat.hacker.to.show.macbook.battery.risk/> But a fix will come in August <http://pinoytutorial.com/techtorial/macbook-battery-exploit-and-hack-possibility-and-fix-coming-soon/> Paul Moortgat