When should I charge my iPhone 4s? - 1

So, i have heard that when you charge it and it reaches 100% then it automatically stops charging, but i have also heard that leaving it on the charger after 100% wears down the battery.

Just charge it overnight like a normal person and quit worrying.
Your phone will be just fine, especially with the quality and hardy battery apple provides, you really should not have anything to worry about. Just plug it in before bed, and it will be waiting with a full battery in the morning.

I've always charged my iphone overnight and the battery has always been great.

When the phone battery reaches 95-98% disconnect the charger, you'll be sure you're not over-charging then.