Share your experience!
@jabarali
well, "WCDMA(preferred)/GSM" setting is the culprit, when ever 3G not required swith to "GSM Only" it makes a lot of difference, use auto power saver mode for brighteness, it automatically adjusts to the lighting conditions and sucks less battery than custom brightness settings, try these tips you'll defnetly see the change, XP on ICS is even better

What kiram Suggested is Right, I am Also getting a decent back up, Have a try
Yep 
you can also know if your phone is fully charge when the thunderbolt sign on the battery bar dissapeared.