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4.5 V.
Thanks you both for that, that was exactly what I needed to know :)
"Andrew Holme" <andrew@xxxxxxxxxx> wrote in message
news:e0usbn$m8e$1$830fa7a5@xxxxxxxxxxxxxxxxxxx
>
> "Richard Harris" <none@xxxxxxxx> wrote in message
> news:tf6dnfnKYLR9bK_ZRVnyiQ@xxxxxxxxx
> > Hi,
> > I have a 1600mAh batter pack and would like to run a 25mA LED of
this,
> > but how long should it run for before the batter dies?
> >
> > Thanks
> >
> >
>
> 1600 mAh / 25 mA = 64 hours using a series current-limiting resistor; but
> there could be a more efficient way to do it. What's the battery voltage?
>
>
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