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This feature is obsolete.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.

The 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.

The battery property has been removed in favor of the standard Navigator.getBattery() method, which returns a battery Promise. Its support is still partial though.


var battery = navigator.battery;


Specification Status Comment
Battery Status API
The definition of 'Navigator.battery' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support38 ?

16 — 501 2

11 — 16 moz

10 — 163

No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ?38 ?

16 — 501 2

14 — 16 moz

10 — 163

No No ?

1. Removed in favor of navigator.getBattery().

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.

See also

Document Tags and Contributors

Last updated by: connorshea,