Battery dropped from 35 to 0 in no time
Today I was using the camera for about 30min. When the battery (with normal drain speed) fell below 40%, the camera app started lagging. Like when I moved the phone around, the camera view had about 3fps. When I finished using the cam, the battery was at 34%. Only 5 mins later, when I tried to turn on the screen, it was 0%. I was using it indoors, so no extreme temperature conditions. The battery usage monitor doesn't show any unusual usage. What's the matter?