I’m an a Battery life on the 4S is on par with the iPhone 4 as far as usage goes. But because the iPhone 4S is just begging to be used in ways that the 4 isn't, dictation, Siri, Notification Center, etc, the battery life can seem to be shorter as a result. So, I've been going a little more extreme with respect to trying to be more conservative and squeeze every last second of power I can get out of the 4S. I’m an a WiFi environment most of the time – home, office, Starbucks. So, I have the luxury to do what I am going to suggest to help you extend the battery life on the iPhone: Turn on Airplane mode and then turn on WiFi if needed. I’ve also turned off location and alerts when I’m at work. I still let e-mails and messaging go through. There it’s that simple. And using Siri and dictation will eat up battery but since I got the 4S, I’ve been Siri daily and dictating my notes, messages, and e-mails. If you don’t, you’ll also...