You could also have accidently bought a pirated copy of the game, which have save batteries that work for a while but then die out.
They do have internal batteries in the cart. You can try opening up the cart using a 3.8mm (usually) security bit. Most of the units have a physical battery that you can replace but some have a soldered unit that cannot be replaced.
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i bought a pokemon emerald yesyterday, when i try to save the game, it said i save the game.. but when i turn off my SP and turn it on again, my save is lost .. help...
Knowing that you are still saying a bill is unpaid when much time has been spent previously on sorting it.
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