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    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.


    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

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


    Inherited from EventTarget:

    Register an event handler of a specific event type on the EventTarget.
    Removes an event listener from the EventTarget.
    Dispatch an event to this EventTarget.


    Specification Status Comment
    Battery Status API Working Draft Last Call Working Draft.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 38 Supports the deprecated navigator.battery.
    10 (10) moz [1]
    16 (16) (without prefix) [2]
    Not supported 25 Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported 39 [3]

    Supports the deprecated navigator.battery
    10.0 (10) moz [1]
    16.0 (16) (without prefix) [2]

    Not supported 25 [3] Not supported


    [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.

    [2] 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).

    [3] Values for BatteryManager.chargingTime and BatteryManager.dischargingTime are always equal to Infinity.

    See also


    最終更新者: fscholz,