It happened on Thursday night, went to bed at 40% woke up and the battery was dead, luckily Friday was a holiday and i didn't need my alarm to wake up, and so whole day on friday i started noticing that whenever it was on standby and i pick it up 30min later i had lost about 7% battery, put it down, an hour later 10% gone and same thing again Friday night went to sleep had about 50% woke up next morning and it was dead, this has never ever happened before, i would sometimes sleep with 20% battery and wake up with 15 to 18% left, whenever i use the phone i don't notice any unusual battery drain, but in standby i lose alot of battery, barely get 3hrs SOT now, gona try a factory reset today if no luck then taking it for repairs even though samsung members app reports battery life is good