How fast does your MBP battery die?

Hi everyone,
I've just received my third Macbook Pro battery. I used it ONCE and now it's down to 98% capacity. What is wrong with those batteries? Are yours degrading as fast?
Detail: I received the brand new battery. Charged it to 100%, left it charged for a few hours, and then drained it until the MBP went to sleep, left it until the LED went out (standard calibration procedure). After subsequent charging the capacity is only 5420 out of 5500 mAh.
Battery one was nearing 70% capacity after 3-4 months and was bulging (swollen battery issue). Battery two had less than 50% capacity left after less than 6 months and would cut power with no prior notice.
MBP 1,8   Mac OS X (10.4.10)  

Clearly your first two batteries were bad. Don't freak out just yet, though. That magic number - 5500 mAh - is the nominal capacity of a new battery for a 15" MBP. Did you actually check the full charge capacity before you calibrated it? Because nominal means "stated or expressed but not necessarily corresponding exactly to the real value" (see definition #3 in the dictionary widget). So, it's possible that you actually started with a 5400 mAh battery which imporved with calibration, or a 5600 mAh battery that dropped more than 2%, etc. Point is, there have been some bad batteries (thank you, Sony!) and you were unlucky to get two in a row, but don't assume a 2% drop means you got a 3rd lemon.
I've got just over 60 cycles, and my battery 'health' fluctuates between 90% and 97% - and yes, I mean fluctuates- as in falls and rises - from charge to charge. Sometimes it will drop 3% in one charge cycle, then rise 5% the next, etc...
So, relax and just keep an occasional eye on it.

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