The event fires when there is a change in the battery status.

window.addEventListener("batterystatus", yourCallbackFunction, false);


This event fires when the percentage of battery charge changes by at least 1 percent, or if the device is plugged in or unplugged.

The battery status handler is passed an object that contains two properties:

  • level: The percentage of battery charge (0-100). (Number)

  • isPlugged: A boolean that indicates whether the device is plugged in. (Boolean)

Applications typically should use window.addEventListener to attach an event listener once the [deviceready](events.deviceready.html) event fires.

Supported Platforms

  • iOS
  • Android
  • BlackBerry WebWorks (OS 5.0 and higher)
  • Windows Phone 7 and 8
  • Tizen

Windows Phone 7 and 8 Quirks

Windows Phone 7 does not provide native APIs to determine battery level, so the level property is unavailable. The isPlugged parameter is supported.

Quick Example

window.addEventListener("batterystatus", onBatteryStatus, false);

function onBatteryStatus(info) {
    // Handle the online event
    console.log("Level: " + info.level + " isPlugged: " + info.isPlugged);

Full Example

<!DOCTYPE html>
    <title>Device Ready Example</title>

    <script type="text/javascript" charset="utf-8" src="cordova.js"></script>
    <script type="text/javascript" charset="utf-8">

    // Wait for device API libraries to load
    function onLoad() {
        document.addEventListener("deviceready", onDeviceReady, false);

    // device APIs are available
    function onDeviceReady() {
        window.addEventListener("batterystatus", onBatteryStatus, false);

    // Handle the batterystatus event
    function onBatteryStatus(info) {
        console.log("Level: " + info.level + " isPlugged: " + info.isPlugged);

  <body onload="onLoad()">