IPhone 4s - Battery issue and poor voice quality

I had bought my iPhone in May this year. It was working fine till i think a week back battery started to drain quickly at 10% every hour. I have configured office exchange account for mail and accessing global exchange contacts, Google account as exchange for contact sync and iCloud. i dont keep any contacts on exchange, keep in Gmail only. Was Android user earlier.
I read a lot of posts and tried all solutions such as turning off timezone service in location, turn off and delete all email accounts, kept manual sync for emails, ran the battery down till switch off and charging back to 100%, removed apps i doubted could be syncing data in background, turned off locaiton service totally, turned off calendar, turned calendar notifications, turned of iCloud reminder, notes but no effect. Wifi and Siri are also off.
I notice today that I am getting small circle near operator name rather than E symbol (for edge)and at the same time voice quality of person on other end is bad too, can hear small cracking , clicking sounds, voice breaks. Otther person can hear me properly. I get back E symbol in some different place than my desk. I havent changed my desk so thats not a possibility either.
Someone had suggested queued network thread with exchange can cause the issue so Installed System Activity Monitor app but it doesn't show battery graph or which process is taking CPU or network time. Moreover, it shows 4-5% less battery level than on top in disharging mode !!
Used to get good stats of what is eating the battery in my old HTC Desire but iPhone doesn't offer such feature to diagnosis. Ideally should not be required if phone works as expected.
What do I need to do to get battery life and voice quality back? I will try voice again at home just to rule out bad network at work.
Thanks,
Ashish

Well, most of what you did is black magic, and has nothing to do with battery drain. But we have no way of knowing how your battery life is below what you think it should be. What are you using it for, what apps do you have, and how much Usage life do you get (settings/general/usage).

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