Have you ever needed to know how much battery charge you have for your iPhone or iPod? If you want the app to be even more "Zen", moving the device once will hide the icons, leaving only the time and battery charge percentage on the screen.

And if you want to know how much time you have left for listening to music, watching videos, talking on the phone, and surfing the Internet, you can just have a quick glance!

To start using the app you need your iPhone, iPod, or iPad, and the necessary free app from NO2. Once you have it, install the app on your device, and the icon will appear on your iPhone's home screen.

You can move the device to see how the fluid moves around inside the battery, and it will also be displayed on the screen.

To charge your battery, open the app, and tap the button to start charging the battery.