I need to check the voltage coming off my batteries...but I think this is my issue.
"New CPU Batteries Die very Quickly.
Just to the side of the battery holder on the CPU board, there are two "blocking" diodes, D1 and D2. These form a diode bridge, blocking the battery voltage from the power supply, and vice-versa. Where these two diodes meet, power goes to the U25 RAM. This way when the game is on, power for the U25 RAM is drawn from the power supply. But when the game is off, power for the U25 RAM is drawn from the batteries.
If either diode D1 or D2 is bad, it can let the batteries attempt to power all the +5 volts logic for the whole CPU board when the game is powered off. Or it can let the +5 volts from the power supply attempt to charge the batteries when the game is powered on. In either case, this will cause the batteries to die quickly.
If you have batteries that are dying very quickly, replace both diodes D1 (1N5817) and D2 (1N4148) on the CPU board. "