MBP shuts off when battery goes down to ~20%

Recently, my MBP started shutting off when the battery level got to 20%. No low battery warning, just shuts off like it got to 0%. I plug it in, turn it on, it boots and battery level is right around 20%.
Battery Information:
Model Information:
Serial Number: SMP-ASMB012-3571-70d
Manufacturer: SMP
Device name: ASMB012
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0300
Cell Revision: 0200
Charge Information:
Charge remaining (mAh): 4420
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 4440
Health Information:
Cycle count: 191
Battery health: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 12544
I took it to the Apple store and the "genious" told me that cycle count is too high and they can't replace the battery under warranty. He said I use it with a battery too much. Last time I checked, I bought a portable computer, it has a battery for a purpose. When I work at a client's office I don't always have it plugged in. What does actually constitute a "cycle"? I've had the laptop for 1 year and 2 months.

Ok, so I'll tell you guys my experience with the genius bar at the Apple Store.
It was about 2:20 pm today, I walked up to the genius bar and waited for someone to come to me -- which took all of 30 seconds. So he asked what my reason for visiting was, and I told him the story about how my battery would just cut off at 30%. He then asked for my computer, so I reached into my laptop bag, pulled it out, and placed it in front of him. It was in sleep mode so we just opened it up to get started; he went to the "About this Mac" from the Apple button in the menu bar and took a look at my serial number. After about 2 minutes he said "I'll be right back." I waited for no longer than two minutes, and he came out from the back with a box in hand. He then flipped my computer over and took my battery off, opened the box, pulled out a new battery and placed it in my computer. Then, all that I had left to do was sign for it, and I was on my way in no more than 10 minutes.
What I find interesting is that he didn't even look at how many "cycles" my battery had; although, it probably wouldn't have made much difference as it was only at 17. At any rate, I asked him if there was a set of defective batteries out there -- including mine -- and basically he told me that yes, there was. So I guess since he looked at my computers serial number, his computer told me that mine was one of the affected ones.
Anyways, bottom line was it was very easy to do to get it replaced, with zero hassle. For the most part, I'm pretty happy with how the Apple Store and genius bar both opperate, much better than dealing with stores like Best Buy and the like -- in my opinion anyways.
Good luck everyone.

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    Battery Information:
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      Manufacturer:          DP
      Device name:          bq20z451
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