> > 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)?

Unfortunately, the recharge'able batteries will be charged in the standard,
commercial charger. (In fact I can't make any assumptions regarding, what
the user will use to recharge the batteries - they will be just standard,
replaceable AA NiMH batteries).
It is also possible (even if discoraged), that the user will put the alkaline
AA batteries, when not having a possibilty to recharge NiMH batteries.
In this case the device must be able to handle the 6V power supply :-(.
-- 
Regards,
Wojtek
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