The Spotify Community has been dealing with overheating and pronounced battery drainage when using the app with iOS 14.8 or 15 installed. According to several users, when Spotify is running, it will often cause their battery levels to drop off at a much faster rate than usual. Some also are reporting that their phones will get extremely hot when listening to music.
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Problems are being reported across several different models, as well, from the iPhone 7 to the iPhone 12. Some users see up to half of their phone's battery being used up by Spotify (according to their usage data), while others say the battery gets drained entirely after an hour.