> I read an article many years ago by someone proposing that 
> the best portable power supply is a single large rechargeable 
> cell and a boost PSU to produce whatever voltage you want.  
> The rationale was that by 
> having more than one cell you never get the best performance, 
> only that of the 
> worst cell, and recharging can never balance them properly 
> without leaving at least one under- or over-charged. 

I think a counter-argument could be that the loss in the converter is at
least partially 'constant-voltage', which would hit a low input voltage
harder than a higher input voltage.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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