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I have a very old SNES and a Donkey Kong Country 3 game. The last few times I played it, it seemed to randomly lose save games. People told me it was battery. Fine, I study electronics, I can fix that.

So I put in a battery holder and a new battery; all secured nice and tight. I played it for a few nights with no problems.

This morning, I took my SNES downstairs with the game in it. I plugged it in, and woop, the save game was gone.

Does anyone have any clue why this game keeps losing its save game?

I am not able to replicate this on purpose by doing the following:

  1. Wiggle the console while the game is in it. (like I would walk with it.)
  2. Shake the cartridge heavily in all directions (to make sure it is not the battery being faulty or disconnecting.)
  3. Plug in the power after no power for at least a few minutes.

Any advice is appreciated.

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Does the game lose the save only when the console itself is turned off? In another words, is it just the cartridges fault? Next, what is the current voltage of the battery inside the cartridge? Probably pointless since it should be new, but it never hurts to try. –  Humungus Jul 10 '13 at 6:58
    
(also, "current voltage" sounds incredibly weird) –  Humungus Jul 10 '13 at 7:00
    
The Voltage on the battery turns out to be 3,38V DC, so that seems to be just fine if not overkill. Also, i am not sure when the savegame erase happens ,but i always do the same thing with this game because of it's past. put game in, power console, play, save game, power off, eject game (i never let it stick in there either) –  Smileynator Jul 10 '13 at 7:44
    
Okay, battery seems fine (but that 0.38V higher voltage is weird). And with your handling, the save delete probably does happen somewhere inside the cartridge, since the console doesn't have much chance to interfere, except when saving. Is this the only cartridge you have this happens with? A bit of a longshot test, but could you try saving, powering off, powering back on and verifying the save is there? –  Humungus Jul 10 '13 at 7:59
2  
@Deruijter Did you read the question? –  BlueRaja - Danny Pflughoeft Jul 10 '13 at 22:51

1 Answer 1

up vote 9 down vote accepted

Let's sum up what we got. Possible reasons:

  1. Battery fault.
  2. SNES fault (for some reason erases saves randomly).
  3. Cartridge fault (memory chip corruption).

So that's that you can do:

  1. Be sure you replaced battery nice and correctly.
  2. Try other games, and see if their saves are not lost.
  3. Try cartridge on some other SNES console and see if it fails there.
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1 and 2 are taken care of, other games do not show the same problems. And i have no other SNES console to test this out on. So i am kind of inconclusive, but it might be a bad cartridge? –  Smileynator Jul 21 '13 at 18:12
    
Certainly, given all the previous tests, I personally would suppose high probability of cartridge failure. –  Petr Abdulin Jul 22 '13 at 2:47
    
Sucks to be me then :< Thanks for the help –  Smileynator Jul 30 '13 at 12:41

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