How to preserve Save Data on SNES games when changing battery?

Hi,

I know how to change the battery in a SNES game.
Easy peasy.

I thought about soldering a lead to give voltage from a cr2023 battery to hold the charge while I resolder a new battery.
This got me thinking. Is there something that I can buy that lets me back up my save data on a CART and then will let me write that data back?

I don't even know if this exists, but I figured with all the brains on here someone may have figured this out.

The reason I'm doing this is because I have a "Super Mario World", the only game I can find from my child hood and it still have my save data on it.
I'd like to keep this for sentimental value...I know, its stupid, but I beat that game as a kid and its the only cart I kept.

Thanks,
Deka

 

I had the same idea once about soldering a temporary battery then replacing the permanent one.
It might work, but you might want to practice on other carts first just to make sure. If those mario saves are really that meaningful to you, better not risk it.

 

I can remember seeing a big cart that you could plug your cart in and it somehow saved to it. A quick Google brings this https://www.youtube.com/watch?v=FsJGbbTe8nU. Don't know if this is what you are after.

 

Hello,
What you could do is de-solder and re-solder a new battery while the cartridge PCB is plugged into the SNES. The SNES must be turned on at all times, thus preserving the save while the battery is not present.

The SNES may need to be partly dissembled to do this.

This is how people preserve there save data on Pokemon games when replacing the cart battery.

 

http://gbatemp.net/threads/replacing-a-snes-save-battery-without-loosing-your-save.361366/ ?

 

Hmm...USB is 5v. that is a good idea.

Looks simple enough. I love that idea. And I never though about looking for a data sheet on a SNES chip.
I think this makes it very easy to preserve the data during the battery change.

Thanks guys.

 

A trick used in the chip tune scene used for the gameboy is changing it while on and resaving, that'll likely work on the SNES as well