Thanks! I actually did a reboot and the level went back to 100%, but then when I charged it last night and unplugged it this morning it went to 98% immediately. I'm also noticing the battery drains faster than my 64GB did. I'm going to keep monitoring it before booking a genius appointment. Hopefully it sorts itself out.
The answers you've gotten so far are the typical ones you'll get.
Let me tell you that you will suffer this issue for the life of your phone. My iPhone 4s started doing the same thing. All the things they tell you to do here may fix it temporarily, but it'll start doing it again.
I can also tell you it will start shutting off on you. Maybe at 10%. Maybe at 20%. The phone will not boot up until you plug it in. It used to happen to me if I took a picture. Someone at my job, it happens to her sometimes when opening Facebook. And hers can be at 50%.
My phone could say 100%. Unplug it, goes to 97%. Or be at 87% then restart it and it would come back at 93%.
Guys here will tell you to turn that off. That it really doesn't matter, but it'll get worse overtime. Bottom line is, you won't be able to make it through a day with the iPhone.
IPhone has been the WORSE phone I've ever owned when it comes to battery. It is awful no matter what the fanboys say. It will get worse. Just get ready.
Like in the Samsung commercials, if you own an iPhone you'll end up hugging a wall eventually.
If battery life is essential for you, then an iPhone isn't ideal.
My G2. I've been using it HEAVY since yesterday because it was mother's day and I took pictures and video and was posting them on Facebook. It has now been off the charger for 24 hours. I'm at 19%.
My G2 is almost a year old. It doesn't shut down. It doesn't go from 100% to 97% or does any weird things when you restarted it when you charge it. It lasts forever on one charge with HEAVY use all day.
If this was running iOS, it would be the best iPhone ever.