if the save battery runs out you can lose MOST hope there, but you can replace it, there are some instructional YouTube videos on it, all you have to do is open the cart up, then you look at the battery on or near it you should see a number, that is the type of battery it is, then you go buy one (i think it has to be the exact one, but im not sure) after that you have to get the battery out of the cartrige, which nintendo made REALLY hard, then you just place in the new battery and tape or super glue it on, i think you can get them replaced a video game stores, but dont count on it, hope it helps
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