Cartridge save batteries die. The saves do not have to.
Every Game Boy, SNES, N64, and Mega Drive cartridge that keeps your progress runs on a coin cell battery, and the 90s were twenty-five years ago. When the battery goes, the game still plays; the save is just gone the next time you look. We replace the battery with the save preserved using the careful live-swap technique, back up and transfer saves and memory cards where the hardware allows, and tell you honestly what a cart can and cannot still hold. Quoted after we look. Walk in or ship it in from anywhere in the U.S.
What we do on the save preservation bench
Quoted after we look, and quoted by cart: the swap differs by console family and board layout, so the number comes from your actual cartridge.
Diagnosis
$49The $49 diagnosis answers the question that matters first: is the save still alive, and is the chip healthy enough to keep holding it. Read, verified, and an honest verdict before any work starts. Free when you approve the work, and free when the verdict is not worth doing.
Battery swap with save preservation
Quoted after we lookThe careful live-swap on Game Boy, Game Boy Color, Game Boy Advance, SNES, N64, and Mega Drive carts: power to the save chip never drops, and the new battery goes in properly soldered or tabbed, the way the factory would have done it.
Save backup & transfer
Quoted after we lookWhere the hardware allows it, the save is read and backed up to a file before the swap, and transfers between carts or memory cards are done where the game supports them. What is and is not transferable gets said plainly first.
Memory card service
Quoted after we lookN64 Controller Paks and the era's memory cards carry the same battery-backed saves and die the same quiet way. Battery checked, save verified, card usable again.
The full-cart pass
Quoted after we lookBattery swap with the save preserved, contacts cleaned, and a wiped-down shell: one pass so the cart plays like it did in 1998 and the save outlives the visit.
Why the save bench stays busy
Every 90s save is on the same clock. These are the three truths of the bench.
25 years is past the design life
Those coin cells were specced for fifteen to twenty years, and the carts are pushing thirty. Any 90s save is living on borrowed time, and the batteries do not warn you before they quit.
The save dies quietly
No warning screen, no drama. The cartridge plays perfectly while powered, and the next time you load it after a few weeks off, the save is a fresh file. Most people find out the hard way; you do not have to.
Honest before we touch it
If the save chip is already failing, a new battery will not save it, and we will tell you at diagnosis instead of taking the job anyway. Preservation works when the chip still holds; we check before we quote.
Mail it in. Carts travel better than consoles.
A five-dollar part is why people post cartridges across the country: the job is tiny, the save is irreplaceable, and the mail gets it here safely.
How a save swap goes
- 01Walk in. 2224 Sunrise Dr, Longmont · Mon–Fri 9–6, Sat–Sun 10–3. Or mail the carts in from anywhere in the U.S.: request an RMA number online first and pack them in a padded mailer.
- 02We check first. The save is read and verified where the cart allows, the battery and the save chip are tested, and one flat quote covers the whole job. You approve before anything starts.
- 03The swap. New battery seated the right way, the save never losing power through the operation, and the save verified reading correctly after. Memory-card and transfer work rides the same bench.
- 04Home. Carts shipped back or picked up, with a 90-day labor warranty and the straight story of what was done.
What we don't do
Scope stated plainly, so you know before you ship anything.
Honest limits
- Care, not miracles. A swap preserves what the chip still holds. If a save is already gone or the chip itself is failing, we say so before touching the cart — and sometimes the honest answer is that the swap is still worth it for whatever the cart holds next, but you hear that verdict first.
- No tape-tab hacks. The new battery goes in the way the factory would have done it: soldered or properly tabbed to the board, not a battery taped in place that falls off in a drawer two years later.
- Bootlegs and repro carts are not our lane. The bench works on licensed hardware. Repro boards have unpredictable save chips and no factory specification to match, so they stay out.
- The other lanes stay on their benches. Screen and shell upgrades live on the Game Boy mods bench; broken consoles go to the console repair bench; the console around the cart gets its own pass on the console restoration bench; full resto-mod commissions are the custom bench, quoted per project.
Cartridge save questions
The things people ask before they trust a 25-year-old save to the mail.
Straight answers
Quoted after we look, and quoted by cart: the swap differs by console family and board layout, so the flat quote comes from your actual cartridge, not a menu. Diagnosis is $49 and free when you approve the work.
No, not the way we do it. The technique is a live swap: power to the save chip never drops while the dead battery comes out and the new one goes in, so the save stays put through the whole operation. A quick pull-and-replace can wipe a save; the careful swap does not. Quoted after we look, and we verify the save reads correctly after the new battery is in.
The classic sign is a save that was there yesterday and gone today, because the battery only matters while the console is off. Time-based games give earlier warnings: the clock in Pokémon Gold, Silver, and Crystal stops and time events freeze, and later games flat-out announce the internal battery has run dry. If a game still holds its save after sitting off for a week, the battery is probably still alive, but old. We test it and quote from what we find.
Then we say so before touching the cart. A battery swap preserves what is still there and stops the next loss; it cannot resurrect a save the chip has already lost, and if the memory chip itself is failing, no battery fixes that. Care and the right technique, not miracles: the honest verdict comes at diagnosis, before any work starts.
Yes, quoted after we look like everything else. N64 Controller Paks and the era's memory cards run the same battery-backed trick and fail the same way, so they get the same careful treatment. Where a game and its hardware support it, we can also back up a save to a file or move it between carts, and we tell you honestly what is and is not transferable before we try.
Yes, anywhere in the U.S. This is the mail-in job: carts are small and light, a padded mailer protects them fine, and people post them across the country for it. Request an RMA number online, ship the carts, and we diagnose within 3 to 5 business days of arrival and email one flat quote. You approve before any work starts.
Twenty-five years of progress is worth one careful swap.
Call the shop any time: our AI receptionist answers around the clock and a human follows up. Or run the repair wizard for a first-pass assessment before you commit to anything. Walk-ins welcome at the Longmont bench, and the mail-in lane reaches every state.