Just in case other people decide to change the battery in their Harmonizer:
I didn't mention this before, but I hope you are following proper ESD procedures. Always make sure that you keep everything grounded (including you) so that there is no problem with static. That is what can kill those delicate circuits you mention…
My guess is the the H8000 (Orville?) motherboard was designed before the firewire board, so when they originally built it, the battery location was probably fine…
