I think the time (4.7 hours) is so high because many people today use their phone as their only computer /internet browswer. In other words, instead of looking at Roadfood.com, and the weather report, and your work e-mails, etc. on your home computer or laptop computers, many people today look at all of these things on just their cell phone. Some even watch movies on their phones. Squinting a phone that long would give me a headache!