(Raytheon, FLIR, whatever the name is this month) may have docs in their archives
to show that.
Personally, I'd suggest getting a battery holder (Radio Shack, Newark Electronics
, DigiKey, Mouser) since the battery may only last a year or two and then you'd be soldering again.
You might also consider that unit probably has a 2nd generation GPS
chip in it. A new GPS would be 4th generation, much better sensitivity, faster fix times, and use WAAS position corrections, which would have been rare 14 years ago. Some are even ready for the Russian, Chinese, and EU systems, which are coming online now. So if you can't find out where the battery connects to...it isn't a total madness to think about replacing it.