Funnily enough, I had my original LoZ for NES in storage for years. Probably 10 or more, without playing it at all. When I pulled it out and played it again, it saved just fine. However, it may be that I just, without meaning to, stored them in the perfect place to keep the battery life up. Also, I seem to remember reading somewhere that the battery life of the NES games was just over 10 years or something like that. I don't know if that means that it will keep things saved for 10 years and then it will lose those, requiring you to charge the battery back up to save again later, or if it means for 10 years that game can be played and saved, but once the 10 years is up you can never save again.

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