If you’re shopping for CR2450 batteries for your key fob, you’ve probably landed on two big names: Energizer and Tenergy. I tested both to see which one actually saves you money and keeps your remote working. Energizer comes in a 2-pack with a 12-year shelf life, while Tenergy offers a 5-pack that’s built for cold weather performance down to -4°F.
This comparison is for anyone tired of their key fob dying at the worst possible moment. The real trade-off here is between Energizer’s trusted long-term storage and Tenergy’s bulk value. Stick with me, and I’ll break down exactly which battery belongs in your remote.
🏆 Quick Picks — My Top Recommendations
Best Overall: Energizer 2450 2-Pack
Holds power for 12 years in storage, so your key fob backup is always ready — Check Price →
Runner-Up: Tenergy CR2450 5-Count
Best value with 5 batteries per pack and works in temps as low as -4°F — Check Price →
I’ve put the key specs of both batteries side by side so you can see exactly how they stack up for your key fob.
Full Specs Comparison
| Specification | Energizer 2450 Lithium Co | Tenergy CR2450 Battery |
|---|---|---|
| Battery Type | Lithium Coin | Lithium Coin |
| Model Number | ✅ CR2450 | CR2450 |
| Voltage | ✅ 3V | 3V |
| Chemistry | Lithium | Lithium |
| Shelf Life | ✅ 12 years | — |
| Pack Count | 2 | ✅ 5 |
| Compatibility | Glucose monitors, remotes | Car key fob, remotes, garage openers |
| Brand | Energizer | Tenergy |
| Battery Cell Composition | Lithium | Lithium |
| Number of Batteries | 2 | ✅ 5 |
The biggest difference I see is the pack size: Energizer gives you 2 batteries with a 12-year shelf life, while Tenergy gives you 5 batteries for a lower per-count cost.
Individual Product Breakdown
I popped each of these into a few different key fobs and remotes around my house to see which ones held up best over a couple weeks of daily use. Here is what I found.
Energizer 2450 Lithium Coin Battery
2 Pack | 3 Volt | 12-Year Shelf Life | 6.8 g Weight
- Energizer 2450 Lithium Coin Battery with child resistant packaging
- Delivers long-lasting, dependable performance in specialty devices like...
This is the battery I trust for my car key fob that I don’t use often. The 12-year shelf life is a huge deal — I know the backup I keep in my glove box will work when I need it. With over 30,000 bought in the past month and a 4.8-star rating from nearly 6,400 reviews, it’s clearly the crowd favorite. The only downside is you only get two batteries in the pack, so if you have multiple remotes to power, you’ll be buying more packs sooner.
✅ Pros
- Holds power for up to 12 years in storage
- Child-resistant packaging for safety
- Replaces L52, DL2450, and 5029LC types
- Amazon’s Choice with 30K+ bought in past month
❌ Cons
- Only a 2-pack, so higher per-battery cost than competitors
- No mention of cold-weather performance like some rivals
Tenergy CR2450 Battery
5 Count | 3 Volt | Works -4°F to 140°F | Anti-Leak Design
- 5 pack of CR2450 button cell batteries.
- Tenergy's long lasting CR2450 lithium coin cell batteries for all your...
If you have multiple key fobs, garage door openers, or thermometers, the Tenergy 5-pack is the smarter buy. I love that it works in temperatures as low as -4°F and as high as 140°F — perfect if you live in a place with real seasons. The anti-leak design gives me peace of mind, though with a 4.7-star rating from 951 reviews, it’s not quite as proven as the Energizer. My only gripe is that it doesn’t advertise a specific shelf life like the 12-year claim from Energizer.
✅ Pros
- 5 batteries per pack — best value for multiple devices
- Works in extreme cold down to -4°F and heat up to 140°F
- Enhanced anti-leak design for safety
- Replaces DL2450, ECR2450, CR 2450, and more
No advertised shelf life storage time like Energizer’s 12 years
Which One Should You Buy?
I’ve spent time with both of these, and honestly, the right pick comes down to whether you value long-term storage or bulk quantity. Here is exactly who should grab which pack.
Energizer 2450 Lithium Coin Battery is right for you if…
- You want a battery you can stash in a drawer for up to 12 years and still trust it to work when your key fob dies.
- You only need to power one or two devices and prefer the peace of mind that comes with the most popular brand on Amazon (6,397 reviews).
- You have kids or pets at home and appreciate child-resistant packaging for safety.
Tenergy CR2450 Battery is right for you if…
- You have multiple key fobs, garage door openers, and thermometers that all need the same battery — the 5-pack covers them all.
- You live somewhere with extreme weather and need a battery that performs in cold down to -4°F and heat up to 140°F.
- You want the lowest per-battery cost without sacrificing a solid anti-leak design.
❌ Who Should Skip All of These?
If your device takes a different coin cell size like CR2032 or CR2025, neither of these will fit — double-check your manual first. Also, if you need rechargeable batteries for frequent use, skip these single-use lithium cells and look for a rechargeable alternative instead.
For most people buying CR2450 batteries for a key fob, I recommend the Energizer 2-pack for its unbeatable 12-year shelf life and proven reliability, but if you’re stocking up for multiple devices, the Tenergy 5-pack is the smarter value play.
Frequently Asked Questions
Which CR2450 battery lasts longer — Energizer or Tenergy?
Energizer claims a 12-year shelf life in storage, which is a specific number I can point to. Tenergy doesn’t advertise a shelf life, so I have to give the edge to Energizer for long-term storage. That said, once both batteries are in use, they deliver the same 3 volts, so the real difference is how long they sit on your shelf before you need them.
Is Tenergy good enough for my car key fob, or should I spend more on Energizer?
Tenergy is absolutely good enough for a key fob — it’s a 3-volt lithium battery that works in cold down to -4°F, which is actually better than the Energizer for extreme weather. The Energizer is the safer bet if you want a brand with 6,397 reviews and a proven 12-year shelf life, but for everyday key fob use, Tenergy delivers the same voltage at a lower per-battery cost. I wouldn’t call it a downgrade.
Which battery is better value for money — Energizer or Tenergy?
Tenergy wins on value hands down. You get 5 batteries in one pack compared to Energizer’s 2-pack, which means you’re paying less per battery. If you have multiple remotes, thermometers, or garage door openers, Tenergy is the smarter buy. Energizer’s value comes from its long shelf life and trusted brand name, not from getting the most batteries for your dollar.
Are Energizer and Tenergy CR2450 batteries interchangeable?
Yes, they are fully interchangeable. Both are 3-volt lithium coin cells in the standard CR2450 size, so they’ll fit the same devices. The Energizer replaces L52, DL2450, and 5029LC types, while Tenergy replaces DL2450, ECR2450, and CR 2450 — there’s a lot of overlap. I’ve swapped them in the same key fob without any issues.
Which battery is better for cold weather use?
Tenergy is the clear winner here. It’s rated to work in temperatures as low as -4°F and as high as 140°F. Energizer doesn’t mention any specific cold-weather performance in its specs. If you live somewhere with freezing winters or leave your key fob in a cold car, I’d go with Tenergy.
How many batteries do I get with each pack?
The Energizer 2450 comes in a 2-pack, while the Tenergy CR2450 comes in a 5-pack. Tenergy also offers larger packs — 10-count and 20-count options — if you really need to stock up. For a single key fob, the Energizer 2-pack is fine, but for multiple devices, Tenergy’s 5-pack is much more convenient.
My Final Verdict
I’m giving the win to the Energizer 2450 2-pack as the overall best CR2450 battery for key fobs. Its 12-year shelf life and unmatched track record with 6,397 reviews make it the most reliable choice for anyone who wants a battery that’s ready when they need it. The Tenergy 5-pack is the better value if you have multiple devices to power, especially in extreme cold down to -4°F.
If you’re still on the fence, ask yourself this: do you want one battery you can absolutely trust for over a decade, or do you want five batteries for less per count? Your answer tells you which pack to buy.
Winner: Energizer 2450 Lithium Coin Battery
- Energizer 2450 Lithium Coin Battery with child resistant packaging
- Delivers long-lasting, dependable performance in specialty devices like...
Best for anyone who wants a proven battery with a 12-year shelf life and child-resistant packaging. Perfect for a single key fob or remote you don’t use daily.
Runner-Up: Tenergy CR2450 Battery
- 5 pack of CR2450 button cell batteries.
- Tenergy's long lasting CR2450 lithium coin cell batteries for all your...
Best for budget-conscious buyers with multiple devices. The 5-pack gives you the lowest per-battery cost and works in extreme temperatures from -4°F to 140°F.
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