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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


The event fires when the battery has reached the critical level threshold.

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


The event fires when the percentage of battery charge has reached the critical battery threshold. The value is device-specific.

The batterycritical 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)
  • Tizen

Quick Example

window.addEventListener("batterycritical", onBatteryCritical, false);

function onBatteryCritical(info) {
    // Handle the battery critical event
    alert("Battery Level Critical " + info.level + "%\nRecharge Soon!");

Full Example

<!DOCTYPE html>
    <title>Battery Critical 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("batterycritical", onBatteryCritical, false);

    // Handle the batterycritical event
    function onBatteryCritical(info) {
        alert("Battery Level Critical " + info.level + "%\nRecharge Soon!");

  <body onload="onLoad()">
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