At what point do you charge your iPhone 5?

I've heard that if you overcharge, it can lessen the battery life. But I find myself charging the phone when it gets down near 20%. Should I wait until it's almost out entirely before charging?

At what % battery life do you charge your own iPhone 5?

You can't overcharge the battery.

Yes, what you're doing is correct. Do not let it entirely drain its battery to 0% but once a month because that's how lithium-ion battery works.

I always charge mine overnight and charge when its between 15 and 30%