I have 3 FujiFilm digital cameras that all use the same type of 5 volt
>chargers. One of the chargers is missing, and I want to give my oldest
>camera to my daughter. I can only find 4.5 volt universal chargers that fit
>the camera's plug-in. I can set the polarity correctly. Will the slightly
>lower voltage damage the camera? Will it be sufficient to recharge the
>battery? I hesitate to "just try it" because of the possible damage. Is
>there a better place for me to post this query?
Chargers like this often have a fair degree of tolerance and personally I suspect it'll work. AFAIUI voltage is like a 'pressure' that pushes the current through, slightly less pressure shouldn't therefore cause any problems - it'll either work or not work.
I've added sci.electronics.misc so one of the large-foreheaded boffins in there can either confirm it, or tell me I'm an idiot.