I'm surprised that you are only getting 4 hours of sot on your s7 edge. I'm getting on average 6 hrs.. Weird.
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Don't see what is weird. I more than likely like in a different location that you, have different signal strength. Probably use the phone differently that you. That's the whole thing with battery life, it will differ for each person. Some times I have had 5 hours, some times 3.5! At the end of the day, I am very happy with the battery life of the S7e.