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

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?