>
>
> After the car shuts off, it won't stay at 14-ish volts for very long, at
> most a few seconds, and that won't hurt anything.


True, and if I used a voltage comparator I wouldn't have to worry about the
pull-in / drop out differential being too large, which it always is if the
contacts can pass any real current.

But I was also concerned about the charge side. These batteries aren't
designed for use in a car, and I want to compensate the charge system for
the temperatures involved.. -30 to 150F isn't an unreasonable span in this
environment.
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