I am copying a post that was closed since I am having the same issue.

Ever since I updated to iOS 11 on my iPhone 5SE, Spotify has been extremely bad with battery drain. Playing 39mins of dowloaded music (Not even streaming) takes 16% of my charge. For comparison playing 4 hours of downloaded music on apple music app takes only 13%. Same volume and same headphones.

On top of that, the phone gets very hot when I’m listening to Spotify. These battery and heat issues have been consistent for the past weeks and are only for Spotify, not any other app. 

I have the lattest Spotify version. 

Moreover, I saw a post from another user reporting this issue that the moderators of the forum decided to close. Is this battery drain an issue that you are looking at it?

I like the Spotify service, but if this is not solved I will obviously have to cancel it.