This was a fun privacy engineering piece of work. The work analyzed a browser mechanism enabling Web sites to read the battery level on user's devices. It turns out the mechanism is not entirely insignificant from privacy point of view.
The work received some attention.
Since then, a numerous creative use of battery data has surfaced. I describe the security and privacy aspect.
This work has drawn some attention; a few below.
In 2016, Mozilla has decided to remove Battery API from Firefox and WebKit.
Story was further covered in international media, such as Guardian.