I don't have my physics books handy - but someone
asked me if there was a way to draw a rough
equivalence between a battery of a certain mAh rating
and a capacitance value.  I thought it was an
interesting question!

It is a given that capactors and batteries are
different animals .  For instance, since the capactor
stores charge, the discharge curve (volts at a certain
current draw versus time) would be linear, in contrast
to the battery whose chemical reations tend to try to
hold the voltage up until the chemistry is nearly used
up.

So the interesting calculation is how many farads per
mAh assuming we stop when the capacitor drops to
(say)2/3 of it's fully charged voltage?  Multi farad
caps are getting inexpensive and fairly small....





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