Is it ok to let your battery drain completely once a month?

I read on the Apple website that it is good to let your battery drain completely once a month then recharging it fully once a month. Is it good to do this? I was also reading that when you complete a charge cycle, it decreases the battery's capacity slightly everytime. I remember doing this every once and awhile on my older iPhone 3GS and about 3 yrs down the road, the battery would read about 60% charge then it would just cut off. It would cut off on its own even when it would read 100%. I just want to charge my iPhone 5 in the best way so it can last a long time, more than 3yrs like the 3GS.