Indicates the amount of time, in seconds, that remain until the battery is fully charged.
var time = battery.chargingTime
time is the remaining time in seconds until the
battery, which is a
BatteryManager object, is fully charged, or 0 if the battery is already fully charged. If the battery is currently discharging, this value is
|Battery Status API||Working Draft||Last Call Working Draft.|
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|Basic support||38||Supports the deprecated
10 (10) moz 
16 (16) (without prefix) 
|Not supported||25||Not supported|
|Feature||Android||Chrome for Android||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||Not supported||39 ||Not supported||25 ||Not supported|
 Disabled by default in Firefox 10.0, but can be enabled setting the preference
true. Starting with Firefox 11.0,
mozBattery is enabled by default.
 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).