I've been keeping a log of my iPhone 4s battery life. Every morning, once unplugged at 100%, I would see how long it would last the entire day, until it either dies or gets to about 2%. Here is the data I've come up with in the past week: iPhone 4 Battery Life Log Sun, March 6: Usage: 4 Hours, 30 Minutes. Standby: 13 Hours, 35 Minutes. 2% Left. Mon, March 7: Usage: 4 Hours, 44 Minutes. Standby: 15 Hours, 30 Minutes. 2% Left. Tue, March 8: Usage: 6 Hours, 44 Minutes. Standby: 15 Hours, 51 Minutes. Died. Wed, March 9: Usage: 8 Hours, 11 Minutes. Standby: 13 Hours, 57 Minutes. Died. Thu, March 10: Usage: 6 Hours, 42 Minutes. Standby: 15 Hours, 36 Minutes. 2% Left. Fri, March 11: iPhone was synced. Inaccurate data. Sat, March 12: Usage: 4 Hours, 8 Minutes. Standby: 15 Hours, 28 Minutes. Died. For Friday, I synced my iphone to my imac, and while doing so, it increased the battery charge, so I didn't include that to my data. Most of my Usage is from listening to music in the ipod app, or playing games (tiny wings!). But I also make calls, text, facetime, and maps. Usually when playing a game for about an hour, battery life drops by about 15-20%. I got 2 questions to ask everyone. 1. When using your phone while it's being charged, does that ruin the phones battery life? I mean, my old macbook, I would use it while it would be plugged into an outlet. From the normal use of about 6-8 hours a day, it would now be about 90 mins to 2 hours. The battery has become dependent on the outlet, and I'm wondering, will the same happen to the iPhone, or is it ok to use it when it's charging, or when having it plugged into your car? 2. I'm curious to see the Battery usage of everyone here. You don't have to keep posting the usage/standby hours you get everyday. Instead, to save space. I think it would be best to consistently update your post with the data you have. Apple does claim that the iPhone has a standby of 300 hours, but I think it's complete BS. I honestly think the best standby time an iPhone 4 can get would be no more than 100 hours. But that's just me. So, if you guys want to share data starting tomorrow, I think it would be nice to see how everyone's phones compare. Oh, I also have all push notifications on (for every app that supports push), the phone is on vibrate, and the screen is at 100% brightness. Not sure how much of an impact that would have on the battery life, just saying.