The HTML5 Battery Status API (Application Program Interface) can be used to generate a handy little number thats yours and yours alone. Battery information can also be used in cases where a user can go to great lenghts to clear her evercookies. In a corporate setting where devices share similar characteristics and IP addresses, the battery information can be. used to distinguish devices behind a NAT, of traditional tracking mechanisms do not work. Browser fingerprinting is certainly being used in the wild though.”]