Can't the corrosion still just easily creep through the wires? I guess it takes a LITTLE time, but still.

And in contrast, your teeth aren't going to explode and ruin your mouth. Sure, they can get bad if you don't brush them but are easily maintained and can be checked on. Batteries can not be "maintained", there is no way to assure they don't leak. You maintain them by replacing them when they die to assure your game keeps getting a charge, but only all the while hoping they don't leak (which is an entirely different issue). There is no upkeep on a specific set of batteries. They leak when they want and can be very unpredictable.

Even if you didn't brush your teeth it would take a long time for them to fall out, which is basically equivalent to the factory original solder-on batteries that take 20-30 years to leak anyways rather than the normal AA-batteries used in some machines. They leaked, but it took forever.

Would you guys recommend a 1 farad memory capacitor for a Bally MPU-35 game going on route? It will be on for around 9 hours daily so charge isn't an issue (hopefully wouldn't overcharge with that amount or anything like that) but I need to be sure my coinage settings are maintained and that voltage to the chip is not lost or else it will default to a lower coinage value. It is almost impossible that the game will be off for longer than a span of a few days (accounting for the event of a major snowstorm or something, but even still unlikely) unless it is shut off waiting for maintenance in which case I would set the values back if they were lost anyways I would assume.

I'm thinking between this and a remote CR3023 battery with a blocking diode in-line. (if it's mounted on the board I won't be drilling a hole in them)

Just picked up the game two or three days ago, it still has the original battery in it which hasn't leaked which will be clipped out VERY shortly. I know how urgent that is.