I did a little experiment today. I didn't use my Mophie Juice pack plus. I decided to see what the battery could do on its own. I took the phone off the charger at 7am and it is now almost 9 and I have 27 percent battery left. I have used my phone today to make calls, browse the web, email, played some Words with Friends, used Siri a lot, listened to a couple of podcasts, downloaded a lot of songs from my cloud storage. Oh, and I watch about a half dozen segments from CNET tv. I still have all of my push notifications on for Facebook, twitter, Google+, and email. I did set my brightness to about 50 percent. But all in all I think the battery life is really good on this device even without the Mophie Juice pack. I am really happy with the iPhone 4S.
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