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 compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 39.0 | 10 (10) moz 16 (16)[1][3] 52 (52)[4] |
No support | 25 | No support |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | No support | 40.0 | 10.0 (10) moz 16.0 (16)[1][3] 52.0 (52)[4] |
No support | 25[2] | No support | 42.0[2] |
[1] 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.
[2] Values for BatteryManager.chargingTime and BatteryManager.dischargingTime are always equal to Infinity.
[3] From Firefox 51, the actual precision is no more to the second, but to the nearest 15 minutes.
[4] From Firefox 52 onwards, the Battery Status API is only available in chrome/privileged code.