Well friends, my friends had the older version of Ubuntu 10.10 on his laptop Lenovo.  He told that he upgraded his Ubuntu as I told him that natty is the worst you will ever see but he finally upgraded. I told that I didn’t liked the Unity introduced as the default look. So I searched for a lot, but didn’t got any solution. So then I logged out and selected for the “Gnome” look during login screen And I got the battery with all the information that I needed. And he was happy. But that was not just the solution I was happy with.
So I just went back to unity and you might be willing to work on unity as the major change on Natty was the Unity. So here is the solution. Open your terminal and type the following:

• sudo add-apt-repository ppa:iaz/battery-status && sudo apt-get update
• sudo apt-get install battery-status

Now just log out if necessary, you will get your detailed battery status.