Should I let my iphone die then recharge?

I have an iPhone 5 is it true thats it's good that once a month you let the phone die out then recharge it to 100%, I usually recharge it at 80% or less so I have it charged the whole day, I charge it overnight also.

Is it true tht you should do this?

Yes it's good for lithium powered batteries

I try to always let it literally die before I charge it. It's much better for the battery.

Answer mine?