Hello I have an iphone 5S, updated to the latest ios version 10.2, but the battery keeps draining in standby mode, even when not using it at all. Tried all the parameters on how to maximise battery life, tried all the steps from all the forums possible, restored the device as new, closed all location services, background app refresh and even turned all the time power reserve, but the battery keeps draining! Anyone who can help me, maybe not being able to restore the device as new properly? or is something that is hardware related? because already run a diagnostic, it shows 95,79% of capacity of being charged to 100% and has only 300 cycles.