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Hi, I got a serious battery issue with my iPhone 5S. This is now almost 3 years old. Since few months battery was draining very fast even during standby time. Few times I diagnosed this from shops and all said there is nothing wrong. But there is something wrong and software updates did not fix it. Currently it is on iOS 8.1.1 and I cannot update to latest iOS because the phone has very limited memory available, most probably it will not fix this issue (as usual) and anyway I don't want those fancy upgraded features. Now got a new problem - a real headache. When battery level is redu