CR2025 vs. CR2032: What’s the Difference?

by Michael on September 19, 2012 · 4 comments

I recently needed to change the batteries in our garage door opener remotes. While at the store, I guessed (correctly) based on memory and appearance that I needed a CR2032 coin-style battery. The alternative was the similar-looking CR2025.


These CR2025 and CR2032 are both 3V lithium batteries that are identical in diameter. When I returned home, I actually found an unopened pack of CR2025 batteries in the kitchen cabinet so I did a side-by-side comparison.

So what’s the difference between the CR2025 and the CR2032?

As it turns out, the only thing that differs between these batteries is thickness (and hence capacity). The CR2025 is thinner than the CR2032, but they otherwise seem to be interchangeable — assuming you can make them fit your device equally well.

The thicker CR2032 is typically rated for 240 mAh whereas the thinner CR2025 is typically rated for 163 mAh.

Thus, the CR2032 will last somewhat longer than the CR2025 under otherwise equivalent circumstances. And of course the CR2032 may be too thick (or the CR2025 may be too thin) for your desired application — though there are possible workarounds.

For example, I needed a new battery in my Suunto heart monitor chest strap last night and had already used the CR2032 batteries that I had bought. Thus, I used a CR2025 and “shimmed” it into place with a small piece of folded-over note card.

While I’m not planning on this as a long-term solution, it worked in a pinch.


{ 4 comments… read them below or add one }

Curious December 30, 2014 at 4:09 pm

We have a remote control for our car. According the the mfg we should use the 2032. Previously we had a 2025,which worked fine. We I replaced it with a 2032 the remote on longer works. Put the 2025 back in and it’s working again. How so?

Reply

Becky January 4, 2015 at 5:16 pm

The remote probably had a failsafe that sensed the higher amperage and wouldn’t allow the circuit to close so as to protect it. Kinda like a circuit breaker in your house.
To say they can always be substituted makes many assumptions.

Reply

Andrew February 1, 2015 at 1:35 pm

Is the amperage different between a 2032 and a 2025? It should be 0.2 milliamps for both. The mAh is different (165 mAh vs. 225 mAh), but that’s just how long the battery lasts, not how many amps. …and would it matter if the amperage was higher? My understanding is that the amperage of the power source should be equal-to or greater-than the specified amount (but not less-than). The device will only draw what it needs and not more.

But I’m no electrician. I haven’t had to know about any of this since high school, and I’m just re-learning a few things for a couple projects right now. Maybe I’m wrong.

Reply

Neil February 21, 2015 at 4:05 pm

Andrew, you are exactly right. Whatever amperage an instrument draws it still draws the same no matter what is available.

Reply

Leave a Comment

Previous post:

Next post: