Marc Nicholas wrote:
> Note Bob said "fast". You can actually charge LiIon/LiPoly with low current
> and measure the "feedback" with good results.
>
>   
Yes, exactly. The thermistor is only important when the charging rate is 
high.

--Bob


> 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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