Battery Cycles not increasing when charging

Hey,
I just noticed something on my MBP (2013, 15'' retina) and wasn't too sure about why this happens:
I use the MBP as my main computer, which mains when I'm at home I always plug it in. This also means that, for example on weekends, it's plugged in for multiple days in a row. Now I noticed this: When my battery is 100% and I keep the MBP plugged it, the cycle count never increases. As far as I know, my old MB (air) didn't behave that way. With my old MB, when the battery reached 100%, it would discharge to about 95% then start charging again, slowly increasing my cycle count. The new MBP always shows 100% battery and the current power usage - read out via the IOKit API apple provides - shows 0 mAh.
Does anyone know if the new MBP is actually "bypassing" the battery when plugged in and at 100%? Or is the cycle count basically wrong?

The battery counts a cycles when it has counted a certain threshold of charge. This means that if you discharge the battery part of the way down then charge the cycle count will not increase until a later charge.
Said another way...
the cycle count increases when the battery accumulates a certain amount of charge. Let's say that threshold is 1000mA-Hr. If you discharge the battery 500mA-Hr, then connect the charger the gas gauge IC will end up counting 500 mA-Hr. You will have to charge another 500 mA-Hr before it counts.
The net effect of this is that your cycle count will stay low IF you run on the charger most of the time becuase there will be little discharge.
Finally... Apple buys the gas gauge IC from companies like Texas Instruments (TI). Apple does not define this behavior.

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