My At&t galaxy s7 (on android 6.0.1) has horrible battery life and standby life. I have seemingly tried everything and followed all the usual instructions, like turning on airplane mode (which seemed to work for standby time but I wouldn't get texts or notifacations so I hope it doesn't come to that), wiping system cash, and much much more, but i still struggle through every day with only around 15% by the end, while my dad does none of this in his s7 edge and ends up with 60% on a BAD day.