My childhood Pokemon Blue cart - 157 hours logged.
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I assume you already swapped the savegame battery?
I think so.
I can't actually remember, as I have had it for about 25 years. I assume I probably replaced it at some point, but batteries in the first Gen games tend to last longer than the later gens, so it might actually be the original.
I’m surprised it works, mine died :(
What would be the point? Swapping it wipes the save anyway.
It's fiddly and can go wrong but a hot swap (wiring a second power source in parallel) is possible.