# HTML5 Battery API
W3C have recently [\[ 28th August 2014\]](http://www.w3.org/TR/battery-status/) introduced Battery API which is compatible with browsers. Previously Mozilla had [Battery API](https://developer.mozilla.org/en-US/docs/Web/API/Navigator.battery) for their Firefox OS.
The aim of this experiment is to write a certain line of code so we can use in both Firefox OS and also as Chrome Extension.
Here we need several files
index.html
app.js
manifest.webapp for Firefox OS
manifest.json for Chrome
I would like to explain only the **API part**
First we have to get whether it is Firefox environment or Chrome.
Then after that we can easily get the battery level, battery charging time, battery dis charging time and level of charge.
> battery.charging is used to know whether we are charging.
> battery.level is used to know the current battery level.
> battery.dischargingTime is used to know how long it will take to discharge.
> battery.chargingTime is used to know how long it will take to charge.
Then you can easily load your app to Firefox OS and Chrome extension. The output will be displayed as below
[](http://technorulerin.files.wordpress.com/2014/11/ed429-chrome.jpeg)
Chrome Extension Battery API
[](http://technorulerin.files.wordpress.com/2014/11/274d1-firefox.png)
Firefox Battery API
You can also download the source code from [Github](https://github.com/viswaprasath/Apps/tree/master/Battery%20app) and try in your local machine.