Did you see this article from Battery University?
Or this Apple web page with links to
Nowhere could I find a current mention,much less a recommendation, of periodic deep discharge/recharging cycles but everywhere there are precautions about the effect of excessive heat on charging Lithium Ion batteries, and in another context (motor home "house" batteries) I found Lithium Ion batteries will not take a charge at temperatures less than 32°F.

I started to write "I assume" but since everyone knows what happens when you assume I am rewording to say, "This leads me to surmise the old practice of periodically deep discharging and recharging batteries applies to NiCad and NiMh batteries but is no longer considered necessary for the current generation Lithium Ion batteries." Of course that is only what I surmise. smirk

(Did I weasel word that enough? confused )

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein