Low Voltage Batteries

The highest temperatures for batteries I know are +200°C (from -55°C).

You find them at electrochempower.com.
Regards Uwe

The battery with the least reaction to high temperature would surely be a battery that uses heat to produce power such as a thermopile or maybe a fuel cell.

As you're only talking of a few watts there are plenty of thermopile generators around, the Russians used them in WWII to generate power from a petrol or similar source.

John.

Lithium Thionyl Chloride cells work well, but only up to about 150 deg C and 0.3A.

with at least 1.0-1.5 amps. - Do you mean 1.0-1.5 Ah capacity?

This is a very specialised application and more information is necessary. What is the application?

What I meant was 1300 MAH, and yes it is specific for vibration and temperature monitoring. Lithium batteries when burnt will produce a very intense heat and are extremly hard to extinguish. Being in a coal mine enviroment this is a problem.

I will assume you meant 1.3Ah = 1300mAh, and not 1300 Million Ah.

I thought mining would have been your application. Try the Lithium Thionyl Chloride batteries from Tadrian http://www.tadiranbat.com/home.php (mining application batteries rated to 130 deg C), or http://www.powerstream.com/ (High temperature versions rated to 150 deg C). All are rated at 3.6V due to the battery chemistry.

I am not aware of any other off-the-shelf, reliable and compact battery chemistry that is suitable for mining applications at very high temperatures (if someone knows of any, let me know).