no man.thats not normal.if have space refuse water resisstant.you can go samsung supporters shop for your problem.

you can turn off auto brightness and use low percent of brightness,in android 7 set your device performance on optimized,turn off auto sync and device nearby and nfc services this services use more power.

hi bro.you can go samsungs shop and say him flash latest rom of your s7 edge.don't flash rom personality because refuse your warranty.