IPhone 4S' iOS6 uses more battery juice or something else?

Hello.
My client's couple years old iPhone 4S (Verizon carrier)'s battery life has been less with the latest iOS 6.x version than iOS 5.x (upgraded iOS a few weeks ago). I re(called/member) that people had this problem when iOS 6 first came out. Is this problem/issue still not fixed as of today? Or is it just a coincident that its battery is old and probably needs to be replaced?
Thank you in advance.

Lawrence Finch wrote:
antdude wrote:
Hello.
Within the last hour, I took a lot of photo(graph)s (a couple of panoramas) of the local outdoors with no flashes and with HDR to experiment. I also did some managements to delete bad shots and used its MMS a few times. The old iPhone had about 100% of battery power, and now it is 43% after taking about 50 shots!
The camera DOES use a lot of power, and it uses it as long as the camera app is open, not just when you snap a picture. So the battery usage taking pictures is not a good measure of the battery capacity. If you take it to an Apple store they can test the battery.
Ah. What is a good way to test its battery usage without going to an Apple store which is not local?

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