Yes the battery can die over time, and yes you can replace it. You can get the goods from Nintendo Repair Shop to fix your games, controllers, systems, etc.
If the battery dies, you do lose all your saved information. You can still play your games, though they might malfunction sometimes, but you won't be able to save.
There is no real set limit on a battery's life expectancy. I have some games that are almost 25 years old and the battery still works fine (Zelda, for example). Supposedly, you may lose your data if a game w/a battery isn't fired up after a long time, but I recently played a Dragon Warrior cartridge that I haven't touched in at least 15 years and it still had my old game saves on it!
It's kind of the luck of the draw about this type of failure but there are some things you can do to prolong your cartridges' longevity. It mainly has to do with proper care and storage.I have only had to replace one battery (so far) in one of my games and it was on a former rental that had no doubt been abused before I got it.
Keep them in a temperature controlled space that doesn't get too hot or cold and isn't subject to high humidity(an uninsulated attic is NOT the best place for your collection)
Don't drop them
Basically, handle with care.
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