MBP battery crapped out, now fan running loudly

While I am waiting for my replacement MBP battery (which I ordered yesterday) it looks like my current battery finally crapped out, as my computer shut down again automatically last night while I was on a plane and I'm getting a big "X" where the battery charge indicator is located. This appears to have caused my fan to run at a higher rate or something of that nature because the fan is now very constant and loud. Everything else on the computer seems to be working fine however, so long as I am plugged in. The question is, is it OK to be using the MBP with the fan running like this until the replacement battery comes in, or should I try to change to setting on the fan? And when I get the new battery in, will THAT make the fan go back to normal?

I do think it's normal. Keep in mind that batteries vary - the "health" is determined with a nominal value as the denominator (5500 mAh for a 15" MBP, which is actually rounded down from the calculated full charge capacity of a new battery, 5555 mAh), but the actual full charge capacity of a new battery varies within a range around that nominal value. So, if you happen to get a battery with a full charge capacity higher than 5500 mAh, iStat or CoconutBattery will report your health as 100% for some time, even though the full charge capacity is dropping - you started from >100%, but the utilities will just show 100%, not a value like 107% even if your battery started with a capacity of 5900 mAh.
The bottom line is that a rechargeable battery starts with a certain capacity, and over time that capacity can only decrease. The decrease is non-linear, and how rapidly it decreases is influenced by a variety of conditions (charging pattern, temperature, etc.).

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