No, not enough, I've seen that battery indicator full a few days ago on the lockscreen. Plus, on ios 6 when the indicator was at 100 it was still charging until a cord showed up.
They changed that in iOS7. The "plug" will no longer show when it is fully charged.
Now when it reads 100% it is done. It will always have the lightning bolt. That confused me too on my iPhone 4s.
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I know. But how do I know when to unplug the iphone? Cause even after 100 it still needs to be charged.
Just unplug it at 100%.
All phones, if you leave them plugged in a while after 100% will appear to take longer to drain down to 99%, but in reality at the end of the day, the phone battery will last the same.
Same thing on Android. Same when I had my iPhone.
So when you see 100% just unplug it.
After a year, your iPhone will start doing very strange things. Shutting off at 30% when you take a picture or open an app. Or you unplug it at 100% and as soon as you take out the cord you'll see the number go to 95%. Then you plug in and goes to 100% again.
Be ready.
You'll come here and ask people to help. They'll tell you to recalibrate. Then they'll tell you to restore the phone as a new phone. This may appear to help the issue, but sure enough, after a week or so it'll start slowly doing it again.
When you get closer to 2 years either replace the battery, or get a new phone.
You could keep the same battery but carry a portable charger.