The iPhone 6S Plus has a battery with 2750 and is a 1080p phone. The S7E has 3600 and a 1440p. The resolution really isn't that absurdly different. The battery, however, still is pretty large in comparison.
Of course, you could be comparing the 6S and S7. That one you have a case for. Of course, the S7 with the bigger battery, supposedly more efficient display, doesn't match the 6S in battery life from what I've read.
You really can't take people insinuating anything less than great about an Android device, can you?
I can take it:
LagDroid, StageBlight, LagShip. Yes I'm being childish - sue me