iPhone 4s Battery drainage
Apple’s Newly marketed iPhone 4s is having battery drainage issue and Apple support is being populated with complaining customers. This has also effected iPhone 4 & 3gs users with iOS5.
it appears that the Setting Time Zone function in iOS 5 might be using excessive power and drains the phone battery since the device is repeatedly checking on user’s location in order to set the time zone based on their current location.
To disable this, Go to Settings, navigate to Location Services > System Services and turn off the Setting Time Zone option. You should see a purple location services icon in the iPhone’s status bar disappear. You can always set it on if you are travelling an you need to get time updated according to your location. But is not quiet necessary to use while in town.