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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