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@ItzZia: Using Scene Optimizer in the Camera app won't affect your battery life in any significant way, if at all. I'd recommend having a play around with the feature, as it can enhance the quality of your photos. If you find that it's not for you, simply tap the swirling symbol in the bottom right of the viewfinder so it says 'Scene Optimiser Off', or tap the cog symbol in the top right > Scene Optimiser > Off to disable it completely.