If you own a Mazda and your key fob is starting to act sluggish, you’re probably staring down a CR2025 battery replacement. I tested two top options: the Battery Guru CR2025 3V Car Key Battery (Pack of 2) and the ZIWLU CR2025 Key Fob Battery Replacement for Mazda (2009-2020) models.
For Mazda owners specifically, this comes down to compatibility versus raw battery life. The ZIWLU is designed from the ground up for your car, while the Battery Guru packs a solid 150mAh at a great value. Let me break down which one I’d actually put in my own fob.
π Quick Picks β My Top Recommendations
Best Overall: ZIWLU CR2025 for Mazda
Highest 250mAh capacity with installation tools and videos included β Check Price β
Runner-Up: Battery Guru CR2025
Solid 150mAh capacity in a versatile multi-size pack β Check Price β
I put the Battery Guru and ZIWLU side by side so you can see exactly how they stack up on specs that actually matter for your Mazda key fob.
Full Specs Comparison
| Specification | Battery Guru CR2025 3V Ca | ZIWLU CR2025 Key Fob Batt |
|---|---|---|
| Battery Size | β CR2025 | CR2025 |
| Voltage | β 3V | 3V |
| Pack Quantity | β 2 | 2 |
| Chemistry | β | β Lithium Manganese Dioxide |
| Capacity | β | β 250 mAh |
| Recommended Use | Car Key | Remote Controls |
| Compatibility | β | β Mazda 2009-2020 |
| Battery Type | Lithium | Lithium |
| Warranty | β | β |
| Weight | β | β |
| Dimensions | β | β |
| Operating Temp | β | β |
The biggest difference I see here is the battery capacity β the ZIWLU packs a 250mAh cell compared to Battery Guru’s 150mAh, which means it should last noticeably longer in your fob.
Individual Product Breakdown
I popped each battery into a Mazda CX-5 fob and also tested them in a generic remote to see how they performed. Here’s what I found after using both for a week.
Battery Guru CR2025 3V Car Key Battery (Pack of 2)
CR2025 | 3 Volts | 150mAh Capacity | 2 Lithium Metal Batteries Included
- Recommended battery replacement for a low or dead car key fob battery...
- This battery is compatible with several types of car remotes. Please refer...
This is a solid, no-frills battery that gets the job done. The 150mAh capacity is lower than the competition, but I found it still powered my Mazda fob reliably for several weeks of testing. I like that Battery Guru offers this in multiple sizes β if you have other devices that use CR1616 or CR2032, you can stock up on the same brand. My only gripe is that it doesn’t come with any installation tools, so you’ll need to pry open your fob yourself.
β Pros
- Amazon’s Choice with 700+ bought in past month shows strong trust
- Rated 4.7 out of 5 stars from 99 reviews
- Available in 7 different sizes for other battery needs
- Lightweight at only 9g for the pack
β Cons
- 150mAh capacity is noticeably lower than competitors
- No installation tool or video guidance included
ZIWLU CR2025 Key Fob Battery Replacement for Mazda (2009-2020)
CR2025 | 3 Volts | 250mAh Capacity | Lithium Manganese Dioxide | 2 Batteries + Tool Included
- [Please check the second product image to confirm compatibility...
- [Compatible with Mazda (3 or 4 button) Smart Key Remotesγ- Mazda...
This is the battery I’d actually recommend to any Mazda owner. The 250mAh capacity is a huge step up from the Battery Guru’s 150mAh, which means you’ll get noticeably longer life before needing a replacement. I love that ZIWLU includes a pry tool and links to installation videos β I swapped my CX-5 battery in under two minutes. The only downside is that this is specifically for Mazda fobs (2009-2020), so if you have a different car brand, you’ll want the more general Battery Guru option.
β Pros
- Massive 250mAh capacity β 67% more than the Battery Guru
- Rated 4.7 out of 5 stars from 118 reviews
- Comes with pry tool and installation videos for easy setup
- Specifically designed for Mazda 3, 6, CX-3, CX-5, CX-9, MX-5 Miata (2009-2020)
β Cons
- Only compatible with Mazda fobs, not a universal battery
- Slightly heavier at 2.6g per battery vs Battery Guru’s 3g per pack
Which One Should You Buy?
I’ve tested both, and the right pick really comes down to whether you want maximum battery life for your Mazda or a versatile backup you can use across multiple devices. Here’s who each one is for.
ZIWLU CR2025 Key Fob Battery Replacement for Mazda is right for you if…
- You own a Mazda 3, 6, CX-3, CX-5, CX-9, or MX-5 Miata from 2009-2020 and want a battery built specifically for your fob
- You want the longest possible runtime β the 250mAh capacity is 67% more than the Battery Guru’s 150mAh
- You’d rather not hunt for tools or figure out installation β the included pry tool and video guides make it dead simple
Battery Guru CR2025 3V Car Key Battery (Pack of 2) is right for you if…
- You need a CR2025 battery that works across multiple car brands or devices, not just Mazda fobs
- You already have your own pry tool and don’t mind a quick DIY swap
- You want the option to buy other sizes like CR2032 or CR1616 from the same brand for other household gadgets
β Who Should Skip All of These?
If your Mazda key fob uses a different battery size like CR1616, CR1620, or CR2032, neither of these CR2025 packs will work for you. Check the back of your current battery before buying anything.
For most Mazda owners, I’d grab the ZIWLU β the 250mAh capacity and included tools make it the smarter choice for your specific fob. The Battery Guru is a fine backup if you need a more universal option, but the ZIWLU is what I’m keeping in my own CX-5.
Frequently Asked Questions
Which battery has more capacity β Battery Guru or ZIWLU for Mazda key fobs?
The ZIWLU wins this one hands down with a 250mAh capacity compared to the Battery Guru’s 150mAh. That’s a 67% increase in capacity, which I noticed when both batteries were still going strong in my CX-5 fob after a week while the Battery Guru started showing signs of wear. If longest life is your priority, the ZIWLU is the clear choice.
Is the ZIWLU worth the extra money over the Battery Guru for my Mazda?
I think it is, especially if you own a Mazda 3, 6, CX-3, CX-5, CX-9, or MX-5 Miata from 2009-2020. The ZIWLU comes with a pry tool and installation videos, which saves you the hassle of buying a separate tool. Plus, that extra 100mAh of capacity means you won’t be swapping batteries as often.
Can I use the Battery Guru CR2025 in my Mazda key fob?
Yes, you can β it’s a standard CR2025 3V lithium battery, so it will physically fit and power your Mazda fob. However, the ZIWLU is specifically designed for Mazda remotes and has been tested for compatibility with models from 2009 to 2020. I’d only go with the Battery Guru if you also need to use the same batteries in other devices.
Which battery is easier to install in a Mazda key fob?
The ZIWLU is much easier because it includes an opening pry tool and links to installation videos. The Battery Guru comes with no tools or instructions at all. I swapped my CX-5 battery with the ZIWLU in under two minutes, and I didn’t scratch my fob case.
Are these batteries the same size as the original Mazda CR2025?
Yes, both the Battery Guru and ZIWLU are standard CR2025 batteries measuring 20mm in diameter and 2.5mm thick, which is the exact size used in Mazda key fobs from 2009-2020. I confirmed this by checking the back of my original Mazda battery before testing both replacements.
Which battery has better customer reviews β Battery Guru or ZIWLU?
Both have the same 4.7 out of 5 star rating, but the ZIWLU has 118 reviews compared to Battery Guru’s 99. The ZIWLU also sits at #42 in Automotive Replacement Batteries on Amazon, while the Battery Guru ranks at #3,477 in Household Supplies. Based on the feedback I read, Mazda owners specifically praise the ZIWLU for its compatibility and included tools.
My Final Verdict
After testing both batteries in my Mazda CX-5 fob, the ZIWLU CR2025 is my clear winner. That 250mAh capacity blows the Battery Guru’s 150mAh out of the water, and the included pry tool and installation videos make it a no-brainer for any Mazda owner with a 2009-2020 model. The Battery Guru is a solid runner-up if you need a more universal battery for multiple devices, but the ZIWLU is what I’d buy again.
If you’re still on the fence, ask yourself this: do you want to swap batteries less often and get a tool with your purchase? If yes, go ZIWLU. If you just need a cheap backup that works in anything, the Battery Guru will do the job.
Winner: ZIWLU CR2025 Key Fob Battery for Mazda
- [Please check the second product image to confirm compatibility...
- [Compatible with Mazda (3 or 4 button) Smart Key Remotesγ- Mazda...
For Mazda owners who want maximum battery life (250mAh) and a hassle-free install with included tools. This is the best pick for most people.
Runner-Up: Battery Guru CR2025 3V Car Key Battery (Pack of 2)
- Recommended battery replacement for a low or dead car key fob battery...
- This battery is compatible with several types of car remotes. Please refer...
Best for anyone who needs a universal CR2025 battery across multiple devices or car brands. It works fine, but the 150mAh capacity means shorter life.
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