Tron not saving high scores with new battery pack

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I'm having problems getting my Tron machine to save high scores. I've

removed the old battery and replaced it with a 3.6V Nicad phone battery

but it will only save the scores for about a day or so. If I don't
turn on the game every day it won't save them. I've left the game on
for over 12 hours so it should be plenty charged up. I also tried
another battery pack with the same result. The game works perfect
otherwise. Any ideas?


Thanks