Returns the current battery level of your device as a number between 0 and 1

Example
<code JavaScript>
function OnStart()
{
//Get battery level
var level = app.GetBatteryLevel()
//convert into percentage
var perlevel = level*100+"%"
var text = "The current battery level is "+perlevel
//Show through popup
app.ShowPopup(text)

}
</code>