I've tried NVRAMs, none have worked for very long.. Tried a few battery kits, those I've had mixed results.. Actually have had luck with a cordless phone battery.
I currently have a cordless phone battery in there, but thought the nvram solution might last longer. I keep forgetting to recharge the battery and lose my score
If its a rechargeable battery, then it should charge on its own from the game.. Unless you have a diode installed in front of it.. Or it's just a dead battery..
I currently have a cordless phone battery in there, but thought the nvram solution might last longer. I keep forgetting to recharge the battery and lose my score