> * Needs to be quite small; the usual AA/AAA are a bit bigger
> than I'd like.  Something about the size of a CR2032 would be
> great, but could be a bit bigger

How about a couple of AAAA alkaline ? 3.65V, 625mAh, can
be boosted to the PIC's Vdd (do you really need 5V for that ?)
and 10V-ish with a simple oscillator


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