Most of the iPhone user may encounter with this problem. Since whenever your battery goes below 20 %, a pop-up menu appears and asks for activating " Low Power Mode ". At first, you find this proposal logical and activate "Low Power Mode". Figure: Low Battery pop-up window appears When this pop-up window appeared, color of the battery icon is red. If you choose Low Power Mode on the screen, then color of the battery icon will be yellow. The scenario goes like this: 1- Battery level goes below 20% and a pop-up appears asking for "Low Power Mode" 2- You activate "Low Power Mode" 3- You plug in your phone to charge it. 4- You are in hurry or you do not have time and you plug out your phone before 80 % level. 5- After a while you recognized that color of battery icon is yellow!!! "OMG there is a problem with my battery". Since color red means " WARNING ", color yellow means " CAUTION " and color...