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    Indicates the current battery charge level as a value between 0.0 and 1.0.


    var level = battery.level

    On return, level is a number representing the system's battery charge level scaled to a value between 0.0 and 1.0. A value of 0 means the battery, which is a BatteryManager object, is empty and the system is about to be suspended. A value of 1.0 means the battery is full. A value of 1.0 is also returned if the implementation isn't able to determine the battery charge level or if the system is not battery-powered.


    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

    Document Tags and Contributors

    Contributors to this page: Sheppy, franciov, fscholz, Jeremie, teoli, eliezerb
    Last updated by: fscholz,