Battery life and portability
				l Short battery life inhibits portability l Battery life enablers – Less than 8 hours – Intermittent mobile use – 8 to 24 hours – Workday use only – 24 hours to 7 days – Always-on – More than 7 days – Untethered travel l Today’s cell phones: – Fit on a belt – Get 1-2 days from a single battery charge