I need about 10mJ energy storage, with a peak voltage of 16V, that can
withstand some fairly high temperatures.
The other half of my problem is that I am faced with very fuzzy
environmental requirements. "Sitting outside in a metal box" is about
as good as I have at this point.
Knowing that alone, I know that electrolytics, at least the ones I'm
familiar with, aren't going to work well.

Batteries are not workable, too much energy and too much cost.

I need something that works like an electrolytic, tolerates much wider
temperature extremes, and costs roughly the same.

Any suggestions?
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