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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 reducing around 45% (sometimes even around 59%) it shuts down suddenly. It doesn't show the usual battery low warnings. When it is plugged and restarts automatically for charging, battery level is displayed around that percentage (around 45%). I searched on the Internet and went thru few articles and forums including Apple discussion forums. There are 2 options. Option 1: Do a Device Firmware Upgrade (DFU) that may solve software and firmware problems (a painful, time consuming process and there is a risk in this). Even after a successful DFU upgrade problem may not be solved and if so you need to go to option 2. Option 2: Simply replace the battery from a shop that will cost some 7,000 - 8,000 rupees I think. Most probably this will fix the problem. If any of you have experience in similar problem/ battery issue with iPhone please let me know how did you fix it/ what do you recommend from above 2 options. Cheers!