> Battery.  Whats a good choice...needs to be SMALL, inexpensive and 
> maybe even solder tabs.  Any pointers?  I know, the bigger the cell, 
> the longer it will last, so its all a tradeoff really.


Zinc Air batteries (commonly used for eg in-ear hearing aids) have 
about the highest volume and mass energy densities available because 
one of the reactants is air which gets added at zero effective weight. 
Main disadvantages are limited shelf life once activated (air hole 
uncovered) and not rechargeable.




        RM 

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