Playing DRM-crippled music will shorten the battery life of your music-player. Listening to DRMed iTunes songs on an iPod shortens the battery life by eight percent; playing back WMA-crippled files on a device from Creative Labs can knock 25 percent off the life of your device's battery. The extra battery-drain is attributed to the computation necessary to decrypt the files and verify their licenses.
We found similar discrepancies with other PlaysForSure players. The Archos Gmini 402 Camcorder maxed out at 11 hours, but with DRM tracks, it played for less than 9 hours. The iRiver U10, with an astounding life of about 32 hours, came in at about 27 hours playing subscription tracks. Even the iPod, playing back only FairPlay AAC tracks, underperformed MP3s by about 8 percent. What I'm saying is that while battery life may not be a critical issue today, as it was when one of the original hard drive players–the Creative Nomad Jukebox–lasted a pathetic 4 hours running on four AA nickel-metal-hydride rechargeables (and much worse on alkalines), the industry needs to include battery specs for DRM audio tracks or the tracks we're buying or subscribing. Yet, here's another reason why we should still be ripping our music in MP3: better battery life, the most obvious reason being universal device compatibility.
(Thanks, Matt!)
