gr8_phk writes "An interesting article over at C|Net claims that playing DRMed music can reduce battery life up to 25 percent. Yet another reason to stick with plain old MP3 files." From the article: "Those who belong to subscription services such as Napster or Rhapsody have it worse. Music rented from these services arrive in the WMA DRM 10 format, and it takes extra processing power to ensure that the licenses making the tracks work are still valid and match up to the device itself. Heavy DRM not only slows down an MP3 player but also sucks the very life out of them."