How does Mac OS calculate the charging Cycle count?

Hello, Guys
How does Mac OS calculate the charging Cycle count? I just used my MBP for about 15 min without power plugged in and I saw it left about 90% battery. However after the battery be recharged, I checked system profiler. It shows charging cycle count increased 1. I do remember that last time I left almost the same percentage of battery and plugged in. After the battery was fully charged, profiler did show cycle count increased.
So I am wondering How does Mac OS calculate the charging Cycle count? Basing on the percentage left or something else?
Thanks,

Ok,
But does it count continuously or separatly? I mean One time I used 10% and recharged full; and next time I used 20% and fully recharged again. Does the OS increase the cycle count when the usage adds up to 100% no matter how many times of recharge?
Thanks,

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