Not a suicide battery in the sense that the system will die if it goes flat.
But it's a suicide battery in the sense that it will eventually leak acid all over the PS board and cause a lot of damage.
There's a couple of easy solutions.
You can put an NVRAM in place on your cpu board and possibly do a mod with the +5v line.
Or you can get a 3.6v cordless phone battery, unsolder your battery on the power board, and solder some wires to cordless phone battery mounted in the bottom of your cab. Then put it in a plastic baggy just in case it ever leaks. Problem solved for at least 2-3 years and it just takes a couple of minutes.