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Unless you're grid charging nightly (PHEV'ing), you don't need to worry about that.
Mike thinks I'm crazy for not running the fan, but in my testing, the battery didn't get hot enough (except in the summer) to worry about it. Most of the year, my battery is too cold. Besides, batteries are cheap. Btw, "no more cold batteries in the winter" is quite the overstatement.
A recalibration is when the BCM decides it was incorrect about the state of charge, and your SOC gauge moves. A "positive recal" is when you hit the BCM's upper voltage threshold, and the SoC jumps to 20 out of 20 bars. A negative recal has you jump to zero or one bar, which is incredibly annoying.
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