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  3. Battery Backup Project - SegaCD BackUp RAM Cart

User Info: SONICR

SONICR
4 years ago#1
Over the last couple years I've been upgrading my carts with new batteries with SMD Battery Holders. When I was working on a NES cart I discovered that most carts use a Battery Backup Capacitor to help the battery live longer, or in case of a dead battery, still save for a period of time apon charged. Sega carts, so far I've gathered, originally use a "16v 47uF" capacitor. NES & SNES use a "6.3v 22uF" capacitor but Nintendo sometimes used tight center motherboard placement, SMD capacitors or revised boards that lack completely a Battery Backup cap circuit or just the cap. This explains the age old "Why my battery still works/Mine are dead" questions.

I'm currently upgrading my caps to larger sizes for longer charge cycles. For NES & SNES there is enough room usually for a 1000uF cap. While Sega and cramped NES&SNES boards will have to use probably a 100-220uF.

I haven't checked the SegaCD console yet to see if it's rechargeable battery has a cap on it's circuit, but hopefully it does.
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  1. Boards
  2. Sega CD
  3. Battery Backup Project - SegaCD BackUp RAM Cart
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