Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Indicates the current battery charge level as a value between 0.0
and 1.0
.
Syntax
var level = battery.level
On return, level
is a number representing the system's battery charge level scaled to a value between 0.0 and 1.0. A value of 0 means the battery
, which is a BatteryManager
object, is empty and the system is about to be suspended. A value of 1.0 means the battery is full. A value of 1.0 is also returned if the implementation isn't able to determine the battery charge level or if the system is not battery-powered.
Example
HTML Content
<div id="level">(battery level unknown)</div>
JavaScript Content
navigator.getBattery().then(function(battery) { var level = battery.level; document.querySelector('#level').textContent = level; });
Specifications
Specification | Status | Comment |
---|---|---|
Battery Status API | Candidate Recommendation | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
level | Chrome Full support 38 | Edge Full support 79 | Firefox
No support
16 — 52
| IE No support No | Opera Full support 25 | Safari No support No | WebView Android Full support 40 | Chrome Android
Full support
38
| Firefox Android
No support
10 — 16
| Opera Android Full support 25 | Safari iOS No support ? — ? | Samsung Internet Android
Full support
3.0
|
Legend
- Full support
- Full support
- No support
- No support
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.