The World Wide Web Consortium, or W3C, which oversees the development of web standards, approved the API in 2012, saying: "The information disclosed has minimal impact on privacy or fingerprinting, and therefore is exposed without permission grants".
However new research has shown that the information is a lot more specific than first assumed.
In The leaking battery A privacy analysis of the HTML5 Battery Status API, authors Lukasz Olejnik , Gunes Acar , Claude Castelluccia and Claudia Diaz warn: "In short time intervals, Battery Status API can be used to reinstantiate tracking identifiers of users, similar to evercookies. Moreover, battery information can 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."

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