You may remember in the news that some electronic cigarette batteries were exploding when they were left plugged in, before the manufacturers started using the different type of charger that cuts the charge, once the battery was at capacity. Kind of the same as electronic cigarette battery chargers which flash red when charging, and green once they are charged. When it's red, power is going into the battery. When it's green, the power is bypassing the battery, thus it's not damaging the battery. I believe that this is what the green or red light on the magnetic charging connector signifies. Once the battery is fully charged, it's my understanding the computer stops putting power to the battery, and uses the power adaptor solely to power the computer. It was the case on older pc laptops, and most probably older macs too, but the newer macs are intelligent enough not to keep pumping power into the battery once it's charged. It is, to the best of my knowledge, complete nonsense that on a newish macbook pro and air, that keeping it plugged into the wall damages the battery. That's about, what? 6 hours/day unconnected to a power source? If you're using it on the go, that's a perfectly reasonable amount of consumption. 12 cycles in about a week and a half sounds pretty normal for a new laptop being used heavily to me. Battery cycles are not a scarce and precious resource to be hoarded. You used your battery a lot, and it wore out.
If you've used 1500 cycles (doing that in a year would be some pretty heavy and impressive use though, I've gotta say), well, that's to be expected. If, in a years time, your laptop's battery only lasts half as long as it did when it was new, but you've only used say, 400 cycles, well, that's not performing up to spec, and it should be covered under your warranty. The 'Battery Cycles' indicator is mainly there so that you can diagnose this. If it dies prematurely (which is the only thing you should really need to pay attention to cycles for), then it's covered under your warranty. Eventually, the battery just won't hold a charge for as long as it did when it was new, but that's why batteries are easily and affordably replaceable. Typically, your battery should be rated for somewhere in the neighborhood of 1000 cycles.
A Battery cycle refers to, more or less, one mostly full discharge and recharge.
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