I was worried on my iPhone. Not sure if I ever fully charged it. The first 2 days have been worrisome.
Always at half battery (16gig on 3G network) before the day was half over. First day I got 20% warning. Keep in mind, maybe only 3 minutes of calls, and just trying out features and games, showing it off for maybe a total of an hour and half, no really long sessions beyond those.
But I finally let it charge for a very long time last night to make sure it was full. And I restored it to get the newer firmware.
So last night I spent about 20+ minutes browsing the app store over wifi, about 5 minutes in cube runner 3d game, a little bit of tinkering. Then it was idle until morning. I've tried to call someone 5 times. I cleaned my house this morning while playing music over headphones for about 35 minutes. While watching an hour show, during the ads I played motionX-poker, the 3D dice game, with vibrate and music off, only SFX. That session was atleast 40 minutes.
After all that, about 3pm in the day right now, only appears to be a quarter or less drained (hard to tell from that small icon).
So it seems to be working better today, if it was like earlier, I'd expect it to be half gone or more. I hope that it was because I did a much longer charge for the first time to really break in the battery, maybe even the new firmware. But I'm going to keep track of it. I don't want to have to always charge it two to three times in a day to be sure I get through the day like before.
Extra note. I've always had the auto brightness on and still is now, but this day I had the brightness slider a little under half, where I might of had it a little over half before.