Re:Show HN: What every browser knows about you
by aembleton on Saturday April 02, 2016 @05:54AM
(#11410932)
Battery levels are exposed in the Battery Status API [1] which is currently implemented on Firefox and Chrome, both desktop and Android editions [2] but not on iOS.
1. https://developer.mozilla.org/en/docs/Web/API/Battery_Status...
2. http://caniuse.com/#search=battery