I've been conducting some tests, comparing the power consumption of Spotify and Deezer on iOS. My findings are that streaming music on Deezer can last up to twice as long as Spotify on a single battery charge. My test were done on both an 6. gen iPod Touch and an iPad Air 2, both running the latest iOS version, screen turned off, wifi enabled and streaming quality set to the highest lossy settings. For example, on my iPod touch I easily can stream music for over 32 hours before the battery runs dry. But Spotify barely manages to give me 16 hours under comparable conditions. How is that even possible? Could it be caused by different audio codecs (mp3 vs. ogg vobis) both services use?