Does the battery weakens by charging the iPhone 5S many times a day?

Does the battery weakens by charging the iPhone 5S many times a day?

As long as the battery is less then 33 percent no. Do not charge it if it is over 33 percent

You should charge it when it's below 20% or at night before you go to sleep. Charging it all the time isn't necessary as any battery has a certain number of charges in it and you want to keep it as long as you can.

Both answers above are wrong. Today's Lithium Ion batteries are state of the art and have no "memory effect" like the older NiCad and mercury batteries. Charge it as you wish. My only other comment is that you shouldn't let it get too low before you charge it because it will cut off at the worst moment when you need it.