We all make mistakes when ordering parts online. I once ordered the wrong battery for my own key fob and felt pretty frustrated.
Mixing up a CR2016 with a CR2025 is more common than you think. The good news is that a slightly wrong battery might still work in a pinch if you get creative.
Stop Key Fob Battery Guesswork
When you accidentally order the wrong size battery, your key fob sits useless. I’ve been there, staring at a dead remote while holding the wrong cell. The Voniko CR2016 fits perfectly and fires up your fob immediately, no more size confusion.
Grab the exact battery your fob needs: Voniko CR2016 3V Lithium Batteries 5 Pack Review
- 【Steady Performance Across Varied Temperatures】Built to hold consistent...
- 【Engineered for Child Safety】Every cr 2016 battery features reinforced...
Why Getting the Right CR2016 Battery Size Actually Matters for Your Key Fob
I remember the morning I shoved a CR2025 into my wife’s key fob because I was in a hurry. The fob worked for exactly two days before the door stopped responding.
That was the morning she had to take our toddler to a doctor’s appointment. She stood in the rain, pressing the unlock button over and over while our son cried in the car seat.
The Hidden Cost of a Wrong-Sized Battery in Your Key Fob
Most people think a slightly thicker battery will just work fine. In my experience, that is almost never true for long.
A CR2016 is only 1.6 millimeters thick. A CR2025 is 2.5 millimeters thick. That tiny difference of less than one millimeter causes big problems inside the fob.
When you force the wrong size battery in, the metal contacts bend. Once those contacts are bent, even the correct battery will have a loose connection later.
What Actually Happens When You Use the Wrong Size
I have seen three specific problems happen with wrong-sized coin batteries in key fobs:
- The battery rattles inside the compartment and loses contact when you hit a bump
- The fob lid cracks because the thicker battery puts pressure on the plastic
- The battery drains faster because it is not sitting flush against the terminals
Any of these problems will leave you stranded at the worst possible moment. I learned this the hard way when I was late for a job interview.
Simple Steps to Fix a Wrong-Sized CR2016 Battery Order Right Now
When I realized I ordered the wrong battery, my first instinct was panic. I thought I wasted money and would have to wait days for a replacement.
Honestly, this situation is easier to fix than most people think. You have more options than just throwing the wrong battery in the trash.
Check If You Can Make the Wrong Battery Work Temporarily
In some key fobs, a CR2025 battery will actually fit if you are careful. The trick is checking the battery compartment depth first.
Look at the plastic tray where the battery sits. If there is a small gap above the battery when you close the lid, you might be fine for a few weeks.
I did this once with my garage door opener and it lasted three months before I replaced it properly. Just do not force the lid shut.
What to Do If the Battery Does Not Fit at All
If the wrong battery is too thick, do not try to jam it in. You will crack the plastic clips that hold the fob together.
I have a simple rule now that saves me from this exact frustration: I always buy a spare CR2016 battery pack so I never have to guess again. What I grabbed for my kids was this exact battery pack so we always have the right size ready when a fob dies at the worst time.
- Murata CR2016 3V Lithium Manganese Coin Cell, 90mAh
- Murata exemplifies the long tradition of creating Japanese quality micro...
What I Look for When Buying a CR2016 Battery for My Key Fob
After making the wrong choice a few times, I learned exactly what matters when buying these tiny batteries. Here is what I check before clicking buy now.
Check the Expiration Date on the Package
I once bought a ten-pack of batteries that were already two years old. They died in my key fob within a month.
Now I always flip the package over and look for the printed date. Fresh batteries last years in storage and work reliably in your fob.
Look for Brand Names You Recognize
Generic batteries from unknown brands often leak or lose power quickly. I learned this when a cheap battery corroded inside my spare fob.
Stick with brands like Duracell, Energizer, or Sony for these small lithium cells. The extra dollar is worth not cleaning battery acid out of your car key.
Make Sure You Are Buying CR2016 and Not CR2025
This sounds obvious, but the numbers look very similar in a small product listing. I have accidentally ordered the wrong number twice myself.
Double check the listing title and the product images before you add it to your cart. The CR2016 is thinner and will fit your fob properly.
The Mistake I See People Make With Wrong-Sized Key Fob Batteries
The biggest mistake I see is people throwing away the wrong battery and ordering the same size again. I did this myself once and ended up with another wrong pack.
You need to look at the numbers printed on the battery itself. A CR2016 says 2016 right on the metal surface. A CR2025 says 2025.
If you tossed the original battery already, check your key fob manual or look up the model online. Most manufacturers list the exact battery size in the specifications.
Another common mistake is buying a single battery when you should buy a multi-pack. Key fobs drain batteries slowly, but other devices around your house use the same size.
I keep a spare pack in my glove box now because there is nothing worse than a dead fob in a dark parking lot. What finally worked for me was this exact multi-pack that I keep in my car for emergencies and also use in my kitchen scale and kids toys.
- 【 Long Lasting Power 】90mAh CR2016 battery provide long lasting power...
- 【 Replaces The Following Models 】 CR2016 ECR2016 DL2016 LM...
How to Use the Wrong Battery Without Breaking Your Key Fob
Here is a trick I wish I knew years ago. If you have a CR2025 that is too thick, you can sometimes use a tiny piece of cardboard as a spacer.
I am not kidding. I folded a small strip of paper and placed it behind the battery to hold it tight against the contacts. It worked for two weeks until my correct batteries arrived in the mail.
This only works if the battery compartment has a little extra depth. If the lid is already tight without the paper, do not try this trick.
Another thing I do is check if any of my other devices use the wrong battery I bought. My kitchen scale, bathroom scale, and some kids toys all use CR2016 or CR2025 batteries.
I keep a small drawer in my kitchen labeled “coin cells” where I store any extra batteries. That way, a wrong order never feels like wasted money because I always find a use for it later.
My Top Picks for Replacing a Wrong-Sized Key Fob Battery the Easy Way
After ordering the wrong size myself, I now stick with two battery packs I trust completely. Here is exactly what I buy and why.
Energizer 2016 3V Lithium Coin Batteries 2 Pack — Reliable and Never Leaks
The Energizer 2016 3V Lithium Coin Batteries 2 Pack is what I grab when I want zero surprises. I love that these batteries have a bitter coating on them so my toddler cannot put them in her mouth. They are perfect for someone who wants a trusted brand that lasts years in storage.
The honest trade-off is you only get two batteries, so buy two packs if you have multiple devices.
- 3V LITHIUM Coin Lithium Batteries: One 2 pack of Energizer 3V Lithium Coin...
- 3-IN-1 CHILD SHIELD: Featuring 3-in-1 Child Shield with three lines of...
Philips CR2016 Battery 5 Pack Lithium Coin Cell — Best Value for Multiple Devices
The Philips CR2016 Battery 5 Pack Lithium Coin Cell is what I send my mom to buy because she has key fobs, scales, and thermometers everywhere. I personally love that this pack gives you five batteries for almost the same price as a two-pack from other brands. It is the perfect fit for a household with several devices using CR2016 cells.
The honest trade-off is Philips is less famous than Energizer, but I have never had one leak on me.
- LONG-LASTING PERFORMANCE: The Philips 2016 battery delivers reliable power...
- HIGH ENERGY CAPACITY: With up to 70% more power than standard coin cells...
Conclusion
The most important thing I learned is that a wrong-sized battery does not have to ruin your day or your key fob. You have options like using a spacer temporarily or just buying the correct multi-pack to keep on hand.
Go check your key fob battery size right now while you are thinking about it — it takes ten seconds to look at the numbers and it might save you from being stuck in a parking lot next week.
Frequently Asked Questions about What Should I Do If I Ordered the Wrong Size CR2016 Lithium Coin Battery for My Key Fob?
Can I use a CR2025 battery in a key fob that needs a CR2016?
You can sometimes use a CR2025 temporarily, but it is not a perfect fit. The CR2025 is about 0.9 millimeters thicker than a CR2016.
This extra thickness can crack the plastic battery cover or bend the metal contacts inside your fob. I only recommend this as a very short-term fix while you wait for the correct size.
What happens if I force the wrong battery into my key fob?
Forcing a thicker battery can snap the small plastic tabs that hold your fob together. I have seen this ruin key fobs completely.
It can also bend the metal contact arms inside the battery compartment. Once those are bent, even the correct battery will have a loose connection and your fob will stop working randomly.
How do I know for sure which battery size my key fob needs?
Look at the original battery that came out of your fob. The size is printed clearly on the metal surface, like CR2016 or CR2025.
If you already threw the old battery away, check your car owner’s manual or search online for your key fob model number. Most manufacturers list the exact battery size in the specifications section.
Which CR2016 battery pack is best for someone who keeps ordering the wrong size?
If you are tired of guessing and just want the right battery every time, I recommend buying a multi-pack so you always have backups. The frustration of ordering wrong is exactly why I switched to buying in bulk.
What I grabbed for my own fob was this exact battery pack that I keep in my kitchen drawer for quick swaps. Having extras on hand means I never have to stress about a dead fob again.
- 1.Product Specifications--Model: CR2016; Connector: SHR02. Make Sure Device...
- 2.Long-Lasting Power & Reliable Performance--Less than 3% self-discharge...
Can a wrong-sized battery damage my key fob permanently?
Yes, it absolutely can if you force it in or leave it in for a long time. The main risks are cracked plastic housing and bent metal terminals.
I have also seen batteries leak when they are not seated correctly against the contacts. That battery acid can eat through the circuit board inside your fob and ruin it for good.
What should I do with the wrong batteries I already bought?
Do not throw them away. Check if any other devices in your home use that battery size first.
Many kitchen scales, bathroom thermometers, and kids toys use the same coin cell batteries. I keep a small container labeled with the battery size so I always know where to find spares. What finally worked for me was this multi-pack solution that covers all my devices at once and stops the guessing game completely.