Battery Myth

According to an Apple specialist.

Last night customer service interaction I found out this useful information. It was buried in the transcript.

My question was "I heard LONG AGO that when getting an new electronic device you are suppose to drain the battery then charge to full then drain it again, to help with battery life. Is that still a thing?"

He told me it was a battery myth and that it actually goes like this.
Say you have 100 charges/cycles left on your battery. During the day you've used 50% of your battery power, and charge it back to full, then you have 99 1/2 cycles left. You would have to use another 50% in-order to use the entire cycle. Now you have 99 cycles.

That made so much more sense. Hope this was helpful.

P.S. Disclaimer: I'm assuming he's being an expert on Apple products (which have Lithium Ion batteries) https://www.apple.com/batteries/ , because I know there are different battery types like:
The Nickel Cadmium (NiCd) battery.
The Nickel-Metal Hydride (NiMH) battery.
The Lead Acid battery.
The Lithium Ion battery.
The Lithium Polymer battery.