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Permissions probably aren't that great UX-wise, but couldn't the API have been simplified instead, only allowing web sites to query remaining battery time? To me, it sounds like the API is vastly overengineered.

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That still leaks a number, let's say it's 0-5h and resolution is 1 minute, that's 60*5 == 300, so roughly 8 bits of entropy.

A `onBatteryLow` callback might do the trick?

Exactly what I thought. The website needs to know whether the battery is low or not, not even how much time it still has. Let the API return a true/false to that question and, if necessary for some usecases, hide the rest behind a default deny permission.

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