Web/API/BatteryManager

DeprecatedThis feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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(): Registers an event handler of a specific event type on the EventTarget.
EventTarget.removeEventListener(): Removes an event listener from the EventTarget.
EventTarget.dispatchEvent(): Dispatches an event to this EventTarget.

Additional methods in Mozilla chrome codebase

Mozilla includes a couple of extensions for use by JS-implemented event targets to implement onevent properties.

Specifications

Specification	Status	Comment
Battery Status API	Candidate Recommendation	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`BatteryManager` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`charging` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`chargingTime` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`dischargingTime` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`level` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`onchargingchange` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`onchargingtimechange` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`ondischargingtimechange` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.
`onlevelchange` Deprecated'	Chrome Full support 38	Edge Full support 79	Firefox No support 16 — 52 No support 16 — 52 No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz Full support 52 Notes' Disabled' Notes' 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 provides 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. Full support 72 Notes' Notes' From this version onwards, `BatteryManager` is only available in chrome/privileged code.	IE No support No	Opera Full support 25	Safari No support No	WebView Android Full support 40	Chrome Android Full support 38 Notes' Full support 38 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.	Firefox Android No support 10 — 16 Prefixed' No support 10 — 16 Prefixed' Prefixed' Implemented with the vendor prefix: moz No support 16 — 52 Notes' Disabled' Notes' 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 provides 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.	Opera Android Full support 25	Safari iOS No support ? — ?	Samsung Internet Android Full support 3.0 Notes' Full support 3.0 Notes' Notes' Values for `BatteryManager.chargingTime` and `BatteryManager.dischargingTime` are always equal to `Infinity`.

Legend

Full support: Full support
No support: No support
Deprecated. Not for use in new websites.': Deprecated. Not for use in new websites.
See implementation notes.': See implementation notes.
User must explicitly enable this feature.': User must explicitly enable this feature.
Requires a vendor prefix or different name for use.': Requires a vendor prefix or different name for use.