Obsolete since Gecko 50 (Firefox 50 / Thunderbird 50 / SeaMonkey 2.47)
This feature is obsolete.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.
battery read-only property returns a
BatteryManager provides information about the system's battery charge level; provides also some new events you can handle to monitor the battery status. This implements the Battery Status API; see that documentation for additional details, a guide to using the API, and sample code.
var battery = navigator.battery;
|Battery Status API
The definition of 'Navigator.battery' in that specification.
|Candidate Recommendation||Initial definition|
11 — 16 moz
10 — 163
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
14 — 16 moz
10 — 163
1. Removed in favor of
2. The Battery API was supported on Android, Windows, and Linux with UPower installed. Support for MacOS was available starting with Firefox 18.
3. From version 10 until version 16 (exclusive): this feature is behind the
dom.battery.enabled preference (needs to be set to
true). To change preferences in Firefox, visit about:config.