Why do Apple devices lead in battery life? Apple's tight control over hardware and software helps. When multitasking under iOS, most apps are suspended in the background so they don't zap your battery; on Android, apps have the freedom to continue running in the background and using up more computing resources and battery.
Recent studies also show that ads in free Android apps such as Fchess and Angry Birds take a toll on battery life, as they spend under 25% to 35% of their energy on game play, but more than 65% to 75% on user tracking, uploading user information, and downloading ads.
