BatteryManager.level

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

Syntax

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.

Example

HTML Content

<div id="level">(battery level unknown)</div>

JavaScript Content

navigator.getBattery().then(function(battery) {
       
    var level = battery.level;

    document.querySelector('#level').textContent = level;
});

Specifications

Browser compatibility

See also

• BatteryManager
• Navigator.getBattery