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navigator.getBattery() read time
http://jsbin.com/zibaraju/1/edit
<div></div>
<script>
var div = document.querySelector('div');
setInterval(function() {
var t0 = performance.now();
navigator.getBattery().then(function() {
var t1 = performance.now();
div.innerHTML += (t1 - t0) + " ms<br>";
}, function() {
console.log('error');
});
}, 1000);
</script>
Reading the navigator.getBattery() every 1000ms (including the very first read)
--------------------------------------------------------------------------
// Chrome Desktop - 38.0.2109.0 (Official Build 286623) canary
1.9339999998919666 ms
0.5879999953322113 ms
0.5550000350922346 ms
0.2690000110305846 ms
0.23200002033263445 ms
0.7070000283420086 ms
0.3179999766871333 ms
// Chrome Android - 38 dev
3.273999987868592 ms
0.6850000063423067 ms
5.814000003738329 ms
1.564000005600974 ms
0.13800000306218863 ms
0.7790000236127526 ms
0.7120000082068145 ms
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