[OM] Help!- My Qiuck Flash AFL question

[ClassicVW]

Ok,
So I now have the bottom battery panel off, and pulled out the two 3V Lithium 
batteries that are wired in there. I am assuming these power both the flash 
and the camera, and were not intended to be replaced by the user. The code on 
the side says 83-07, so i also assume they were in there since 1983. The 
designation is "BR- 2/3 A 3V". Can I just buy two 3V lithiums and solder them 
in place of these if I keep the heat of the soldering gun low?

TIA,
George S.