> The problem is that the power supply voltage for fully charged batteries is
> equal to 5.6V which is above acceptable limit for PIC18F4550.
> On the othe hand The fully discharged batteries provide only 4.4V (while PIC
> needs at least 4.2V).

If you control tghe charging it might be an idea to charge only up to 
5.5V (minus some inaccuracy margin)?

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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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