Note Bob said "fast". You can actually charge LiIon/LiPoly with low current
and measure the "feedback" with good results.

I just built a MAX1555 USB-powered LiPoly charger like this...smaller than a
quarter, too ;-)

-marc

On 4/27/06, Bob Axtell <engineer@cotse.net> wrote:
>
> Dimitrios Kapousouz wrote:
> > Hello
> >
> > I have some spare Li-on batteries from some mobile phones i used in the
> > past. Yesterday i was thinking about using some of them as a power
> supply to
> > some small devices. My problem is i don't know exactly the functionality
> of
> > the pins. I find 2 GND pins 1 Vdd pin and an other pin in some batteries
> > without any sign, in others called "T". What is this "T"? Also is
> charging
> > of Li-on batteries the same way as Ni-Cd?
> >
> > Thanx
> >
> > PS: I remember some time ago talking about a good program that is useful
> > while debugging (with MCUs & the RS-232 port) . Can anyone help me
> remember
> > the name? thanx
> >
> That means THERMISTOR. Usually it is standardized at 10K @ 25C so that
> all chargers will work
> properly. Theoretically all fast charge algorithms require a thermistor
> to measure temperature of the
> battery to prevent runaway overheating.
>
> --Bob
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