This problem is new!! After the last update my battery drains very quickly. As soon as it reaches 15% i can see the battery drop like a timer to 0... doesnt even last a minute. also when there are no apps running!! What should i do, this is really annoying. My phone is just 1 year old and i did not expect such problems. If anyone has any solution or facing the same problem please do comment.
had few time the same issue but it happened when I was outside in cold weather when temperatures fluctuate to low or high the battery behaves different. other thing you can try is recalibrate your battery. to do so. discharge your phone completely and then charge it up to full without interruption. if still issues better to check the battery