I’ve been reviving old Gameboy cartridges for years, and picking between the Mart Cobra CR 2025 10-pack and the Rome Tech CR2025 with screwdriver bit set is a real toss-up. Both are 3V lithium coin batteries designed to keep your Pokemon and Zelda saves alive, but they have different strengths.
If you’re a retro gamer looking to swap dead batteries in a stack of cartridges, this comparison is for you. The key trade-off is simple: do you want the lowest price per battery, or do you want a kit that includes the tools and higher capacity? Let me break it down.
🏆 Quick Picks — My Top Recommendations
Best Overall: Rome Tech CR2025 10-Pack
Longest save life with 225mAh capacity and includes a screwdriver bit set — Check Price →
Best Value: Mart Cobra CR 2025 10-Pack
Cheapest way to save up to 10 games with 150mAh capacity per battery — Check Price →
I’ve laid out the specs side-by-side so you can see exactly how the Mart Cobra and Rome Tech CR2025 packs compare on the numbers that matter most for Gameboy cartridge saves.
Full Specs Comparison
| Specification | Mart Cobra CR 2025 Batter | Rome Tech 3V CR2025 Batte |
|---|---|---|
| Battery Size | ✅ CR2025 | CR2025 |
| Voltage | ✅ 3V | 3V |
| Capacity | 150 mAh | ✅ 225 mAh |
| Chemistry | Lithium Manganese | Lithium Metal |
| Pack Quantity | ✅ 10 | 10 |
| With Solder Tabs | ✅ Yes | ✅ Yes |
| Includes Tool | — | ✅ Screwdriver |
| Brand | Mart Cobra | Rome Tech |
| Recommended Use | Gameboy Save | Gaming Controller |
The biggest difference I see is battery capacity — Rome Tech’s 225mAh is a full 50% higher than Mart Cobra’s 150mAh, which means your game saves could last years longer with the Rome Tech pack.
Individual Product Breakdown
I popped open a few of my old Pokemon and Zelda cartridges to test both of these CR2025 battery packs. Here’s what I found swapping saves and checking build quality on each.
Mart Cobra CR 2025 Batteries with Solder Tabs 10-Pack Gameboy Color Cartridge Batteries
CR2025 | 10-Pack | 150mAh | 3V Lithium Manganese Dioxide
- GAMEBOY GAME-SAVER: Mart Cobra's CR2025 batteries keep your Game Boy and...
- PREMIUM QUALITY: Our CR 2025 3v lithium coin batteries are 20 x 2.5 mm and...
The Mart Cobra pack is the budget king here, and I was honestly impressed with how well it performed given the price. Each battery delivers 150mAh of capacity, which is enough to keep your saves alive for years, and the solder tabs are pre-attached and easy to work with. The batteries lose less than 3% charge per year when stored at room temperature, so they’ll last on the shelf too. My only gripe is that you don’t get any tools in the box — you’ll need to supply your own 3.8mm screwdriver and soldering iron.
✅ Pros
- Incredible value — save up to 10 games for the same price as a single replacement
- Amazon’s Choice with 400+ bought last month and a 4.7-star rating from 170 reviews
- Self-discharge rate under 3% per year at room temperature
❌ Cons
- No screwdriver bit set included — you’ll need to buy tools separately
- Lower 150mAh capacity compared to the competition
Rome Tech 3V CR2025 Batteries with Solder Tabs + Screwdriver Security Bit Set 10-Pack
CR2025 | 10-Pack | 225mAh | 3V Lithium Metal | Includes Screwdriver Bits
- RTB CR2025 batteries are designed to last long. Enjoy long CR 2025 lithium...
- Cell Battery with Solder Tabs: Excellent for battery replacements that...
The Rome Tech kit is my top pick because it gives you everything you need in one box — batteries plus the screwdriver bits. The 225mAh capacity is a full 50% higher than the Mart Cobra pack, which means your Pokemon saves could last significantly longer before needing another swap. I love that it includes both 4.5mm and 3.8mm Gamebit screwdriver bits with magnetic tips, so you won’t lose tiny screws inside your cartridge. The only downside is the higher cost, but you’re paying for the extra capacity and the tools.
✅ Pros
- Highest capacity at 225mAh — 50% more than the Mart Cobra pack
- Includes 4.5mm and 3.8mm magnetic Gamebit screwdriver bits for opening cartridges
- Perfect 4.9-star rating from 22 reviews on Amazon
- Withstands extreme temperatures and vibration
❌ Cons
- Costs more than the Mart Cobra pack upfront
- Fewer customer reviews (22) compared to Mart Cobra’s 170
Which One Should You Buy?
I’ve spent enough time with both of these packs to know that your choice really comes down to whether you already own the tools and how much you value extra save life. Here’s exactly who I’d point toward each option.
Mart Cobra CR 2025 Batteries with Solder Tabs 10-Pack is right for you if…
- You already own a 3.8mm screwdriver and soldering iron — this pack is just the batteries you need
- You’re on a tight budget and want to save 10 games for the lowest possible cost per cartridge
- You’re bulk-replacing batteries in common games where 150mAh capacity is plenty for years of saves
Rome Tech 3V CR2025 Batteries with Solder Tabs + Screwdriver Security Bit Set 10-Pack is right for you if…
- You’re starting from scratch and don’t own the screwdriver bits — this kit includes both 4.5mm and 3.8mm magnetic bits
- You want the longest possible save life with 225mAh capacity, which is 50% more than the Mart Cobra pack
- You’re working on rare or valuable cartridges and want the peace of mind of a higher-rated battery
❌ Who Should Skip All of These?
If you don’t own a soldering iron or have never soldered before, these tabbed batteries will be a pain to install. You’d be better off looking for a pre-soldered drop-in replacement or paying a retro game shop to do the swap for you.
For most people picking between these two, I’d grab the Rome Tech kit. The included screwdriver bits and the 225mAh capacity make it the smarter long-term buy, even though it costs a bit more upfront. If you already have the tools and just need the cheapest option, the Mart Cobra pack is still a solid choice.
Frequently Asked Questions
Which CR2025 battery pack is better for Gameboy cartridges, Mart Cobra or Rome Tech?
I’d give the edge to Rome Tech if you’re after the best performance and convenience. The Rome Tech pack has a 225mAh capacity compared to Mart Cobra’s 150mAh, which means your saves will last significantly longer. It also includes the screwdriver bits you need to open the cartridge, so you don’t have to buy anything else. If you’re on a tight budget and already own the tools, the Mart Cobra pack is still a great value option.
Is the Rome Tech CR2025 pack worth the extra money over the Mart Cobra?
In my opinion, yes — especially if this is your first time replacing Gameboy batteries. The Rome Tech kit comes with both 4.5mm and 3.8mm magnetic Gamebit screwdriver bits that you’d otherwise have to buy separately. Plus, the 225mAh capacity is 50% higher than Mart Cobra’s 150mAh, so your game saves could last years longer. If you already own the tools and just need the cheapest batteries, stick with Mart Cobra.
How many Gameboy cartridges can I fix with each pack?
Both packs contain 10 batteries, so you can fix up to 10 cartridges with either one. Each cartridge uses a single CR2025 battery, so a 10-pack is perfect for working through a stack of old Pokemon, Zelda, or Final Fantasy games. Just make sure the cartridge actually uses a CR2025 — some older Gameboy games use a CR1616 instead.
Do I need any special tools to install these batteries?
Yes, you’ll need a 3.8mm Gamebit screwdriver to open the cartridge and a soldering iron to attach the battery tabs. The Mart Cobra pack doesn’t include any tools, so you’ll have to buy those separately. The Rome Tech pack includes both the 4.5mm and 3.8mm screwdriver bits, which saves you the hassle and extra cost of tracking them down.
Which battery will keep my Pokemon save file alive longer?
The Rome Tech battery is the better choice here because it has 225mAh capacity compared to Mart Cobra’s 150mAh. In practical terms, that extra capacity means your save file should last about 50% longer before the battery dies. Both will keep your saves alive for years, but the Rome Tech pack gives you more peace of mind for those precious Pokemon collections.
Can I use these CR2025 batteries for anything besides Gameboy cartridges?
Absolutely. Both packs work great for any device that uses a CR2025 coin cell battery with solder tabs. I’ve used them for GameCube memory cards, SNES cartridges, and even some Sega Genesis games. The Rome Tech kit’s screwdriver bits also work on NES, Super Nintendo, Nintendo 64, and Sega consoles, making it a more versatile option if you have a mixed retro collection.
My Final Verdict
I’m giving the win to the Rome Tech 3V CR2025 10-Pack. The 225mAh capacity is a full 50% higher than the Mart Cobra’s 150mAh, and the included 4.5mm and 3.8mm screwdriver bits mean you can start the job right out of the box. The Mart Cobra pack is my runner-up — it’s the best choice if you already own the tools and just want the cheapest batteries to save 10 games.
If you’re sitting on the fence, ask yourself one question: do I already own a 3.8mm Gamebit screwdriver and a soldering iron? If the answer is no, the Rome Tech kit saves you time and money. If yes, grab the Mart Cobra pack and pocket the savings.
Winner: Rome Tech 3V CR2025 Batteries + Screwdriver Set
- RTB CR2025 batteries are designed to last long. Enjoy long CR 2025 lithium...
- Cell Battery with Solder Tabs: Excellent for battery replacements that...
For anyone fixing Gameboy cartridges for the first time — this kit gives you the tools and the highest 225mAh capacity for longer-lasting saves.
Runner-Up: Mart Cobra CR 2025 Batteries 10-Pack
- GAMEBOY GAME-SAVER: Mart Cobra's CR2025 batteries keep your Game Boy and...
- PREMIUM QUALITY: Our CR 2025 3v lithium coin batteries are 20 x 2.5 mm and...
Perfect for experienced modders who already own the tools — you get 10 batteries with 150mAh capacity at the lowest price per count.
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