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/DOM

BatteryManager

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This feature is obsolete.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.

The BatteryManager interface provides ways to get information about the system's battery charge level.

The navigator.getBattery() method returns a battery promise that is resolved in a BatteryManager interface which you can use to interact with the Battery Status API.

Properties

BatteryManager.charging Read only
A Boolean value indicating whether or not the battery is currently being charged.
BatteryManager.chargingTime Read only
A number representing the remaining time in seconds until the battery is fully charged, or 0 if the battery is already fully charged.
BatteryManager.dischargingTime Read only
A number representing the remaining time in seconds until the battery is completely discharged and the system will suspend.
BatteryManager.level Read only
A number representing the system's battery charge level scaled to a value between 0.0 and 1.0.

Event handlers

BatteryManager.onchargingchange
A handler for the chargingchange event; This event is sent when the battery charging state is updated.
BatteryManager.onchargingtimechange
A handler for the chargingtimechange event; This event is sent when the battery charging time is updated
BatteryManager.ondischargingtimechange
A handler for the dischargingtimechange event; This event is sent when the battery discharging time is updated.
BatteryManager.onlevelchange
A handler for the levelchange event; This event is sent when the battery level is updated.

Methods

Inherited from EventTarget:

EventTarget.addEventListener()
Register an event handler of a specific event type on the EventTarget.
EventTarget.removeEventListener()
Removes an event listener from the EventTarget.
EventTarget.dispatchEvent()
Dispatch an event to this EventTarget.

Additional methods for Mozilla chrome code

Mozilla extensions for use by JS-implemented event targets to implement on* properties. See also WebIDL bindings.

  • void setEventHandler(DOMString type, EventHandler handler)
  • EventHandler getEventHandler(DOMString type)

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
charging 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
chargingTime 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
dischargingTime 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
level 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
onchargingchange 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
onchargingtimechange 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
ondischargingtimechange 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
onlevelchange 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
charging 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
chargingTime 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
dischargingTime 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
level 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
onchargingchange 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
onchargingtimechange 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
ondischargingtimechange 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
onlevelchange 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

Edit this page on MDN

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager