Randomly charge iPhone 5S battery?

Hi, I just bought a new iPhone 5s and I want to know if it's bad for the battery if I randomly charge it through the day, f.e.: I don't use it and it's on 76% and I put in on charge. Is charging often bad? HOw often should I charge it?

Regularly charging reduce the life span of battery.Charge the battery when its completely discharge.

More you charge, more you loose battery life span. Charge when it's at 10% or so.

I would charge when its gets down around 20% or less, thats what I do.

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