My actual question is, when i leave my device while wifi turned on for exact 1 hour and it drain 4% battery, no download any data, just stayed on screen off state, but when i leave my device for the same 1 hour with mobile data turned on then its drain only 1% battery. Is this normal? I had tested it many times but result is same, wifi eat more battery than mobile data. I think it's not normal, am. I right? I think there is some software issue right? And also i like to mention that, this issue started from since October update. Thanks.