I'm wondering if anyone has a source for a program which,
given a type of cell and a current load, can provide an
estimate of runtime down to a certain voltage.

For example:  if I have a circuit which will consume 450 uA
until the input voltage drops to 2.7V, how long can that sit
until it reaches 2.7V (assuming two 1.5V AA alkaline cells)?

Failing that, does anyone know where I can find equations
to solve?

Mike H.

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