W3cubDocs

/DOM

BatteryManager.dischargingTime

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This feature is obsolete.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 amount of time, in seconds, that remains until the battery is fully discharged.

Even if the time returned is precise to the second, browsers round them to a higher interval (typically to the closest 15 minutes) for privacy reasons.

Syntax

var time = battery.dischargingTime

On return, time is the remaining time in seconds until the battery, which is a BatteryManager object, is fully discharged and the system will suspend. This value is Infinity if the battery is currently charging rather than discharging, or if the system is unable to report the remaining discharging time.

Example

HTML Content

<div id="dischargingTime">(discharging time unknown)</div>

JavaScript Content

navigator.getBattery().then(function(battery) {

    var time = battery.dischargingTime;

    document.querySelector('#dischargingTime').textContent = battery.dischargingTime;
});

Specifications

Specification Status Comment
Battery Status API Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 38 ? 16 — 52
16 — 52
10 — 16
Prefixed
Prefixed Requires the vendor prefix: moz
52
Disabled
Disabled by default in Firefox 10, but can be enabled setting the preference dom.battery.enabled to true. Starting with Firefox 11, mozBattery is enabled by default. The Battery API is currently supported on Android, Windows, and Linux with UPower installed. Support for MacOS is available starting with Firefox 18. Firefox also provide support for the deprecated navigator.battery.
Disabled From version 52: this feature is behind the dom.battery.enabled preference. To change preferences in Firefox, visit about:config.
52
From this version onwards, the Battery Status API is only available in chrome/privileged code.
No 25 No
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support 40 38
38
Values for BatteryManager.chargingTime and BatteryManager.dischargingTime are always equal to Infinity.
No 10 — 16
Prefixed
10 — 16
Prefixed
Prefixed Requires the vendor prefix: moz
16 — 52
Disabled
Disabled by default in Firefox 10.0, but can be enabled setting the preference dom.battery.enabled to true. Starting with Firefox 11.0, mozBattery is enabled by default. The Battery API is currently supported on Android, Windows, and Linux with UPower installed. Support for MacOS is available starting with Gecko 18.0 (Firefox 18.0 / Thunderbird 18.0 / SeaMonkey 2.15). Firefox also provide support for the deprecated navigator.battery.
Disabled From version 16 until version 52 (exclusive): this feature is behind the dom.battery.enabled preference. To change preferences in Firefox, visit about:config.
52
From this version onwards, the Battery Status API is only available in chrome/privileged code.
25 ? — ? Yes

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager/dischargingTime