Quote Originally Posted by wiggyx View Post
The problem is that they don't work. Even if they do, it's not for very long and they almost never actually save your game.
I actually came across a bootleg Firered cart like the one pictured above, it worked and saved fine while I had it. They stop saving when the cheap batteries die, those can be replaced if someone wants to do that. With older console bootlegs from the 90's most games don't save because they didn't bother to make the carts capable of saving, it's not just a dead battery or something else that's fixable.