The DS1822 works well to monitor battery pack temperature.
It uses the same connection normally made by the thermistor.

I wrote and debugged the ASM code in less than 4 hrs. It  is a
very nice chip; too bad it is made by Maxim. I used the 10-bit
mode, takes 200mS to convert the 10 bits. I read the update
every 2-3seconds.

My system uses a big PIC and each battery pack has a PIC12F675
to interface with a voltage A/D and the 1-Wire temp chip. The big
PIC  toggles  a  pin on the 12F675, and the F675 presents data
for the 20 bits of data passed, i.e. 10bits of C-temp reading and
10 bits of 12V voltage reading. 

--Bob Axtell
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