Replacing a SNES save battery without loosing your save.

Discussion in 'Other Consoles & Oldies' started by snake2, Jan 29, 2014.

  1. snake2

    snake2 Advanced Member

    Oct 25, 2008
    United States
    So I have been digging around and found my old SNES and games. So I wanted to replace the batteries in my games but if possible I wanted to see if there was a way I could keep my save. My first go with Super Metroid did not work but my next 2 attempts with Donkey Kong Country and Legend of Zelda both worked without any issues.

    Some shots of the Super Metroid PCB

    And check and make sure the game is still saving

    For my first attempt I decided to try powering the SRAM directly, to do this I cut off the end of a mini USB cable and stripped the red (+5v) and black (ground) wires.

    Then I checked the data sheet and wired the USB cable onto the chip to give it a 5v supply

    And installed the new battery

    unfortunately the save was lost but I still have a few more ideas. Next up I tried Donkey Kong Country but no pictures of that so instead here are some pics from Legend of Zelda. First gotta check and make sure the game still has a save.

    OK next take lets take it apart.

    Next using the same USB cable from Super Metroid this time I soldered so that the whole board has power. I soldered to the capacitor right by the 5 volt pin.

    Now that the board has power from the USB cable I can remove the battery

    Then install a new battery

    Then disconnect the USB cable from the PCB

    Now plug it back into the SNES and my save is still on the cart

    A few things to consider temperature increase the resistance so let the board cool down after soldering the USB cable onto the board before you remove the battery.and let the battery cool down before removing the USB cable.
  2. kristianity77

    kristianity77 GBATemp old fogey

    Jul 10, 2003
    Bewdley, UK
    More than anything you could do with getting a bloody duster out! :lol:
  3. pwsincd

    pwsincd Garage Flower

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    Dec 4, 2011
    Manchester UK
    God i love that old super big pcb etching...
  4. RowanDDR

    RowanDDR SNES Lover

    Apr 13, 2006
    For those without soldering skills.. buy/borrow a cheapo SNES Copier (Super UFO?), backup the cartridge SRAM to floppy disc... then restore it after installing the new cartridge battery.