A CR2025 will not reliably replace a CR2032, even though they look similar
The two batteries are the same diameter but different thicknesses. A CR2032 is 3.2 millimeters thick; a CR2025 is 2.5 millimeters thick. That 0.7-millimeter difference matters because the battery contacts in your device are spaced for the thicker battery. When you insert a CR2025, it sits too loose in the compartment, and the metal contacts may not press firmly enough to complete the circuit. Your device either will not turn on or will work intermittently.
Some devices have looser battery compartments than others, so a CR2025 might work in one gadget and fail in another. But you should not count on it. The safer approach is to use the battery type your device manual specifies.
Key Takeaways
- CR2025 and CR2032 batteries are the same width but different thicknesses, so a CR2025 sits loose in a CR2032 slot.
- A loose battery may not make reliable contact with the device's metal terminals, causing the device to fail or work only sometimes.
- Some devices tolerate the thickness difference better than others, but substituting is not reliable.
- If your device calls for a CR2032, buy a CR2032; if it calls for a CR2025, buy a CR2025.
Why the thickness difference causes problems
Battery compartments are engineered with specific tolerances. The spring or metal contact that presses against the battery's flat top is positioned to work with a battery of a known height. When you use a thinner battery, that contact has to compress less to reach the battery surface, which means less pressure and a weaker electrical connection.
Weak connections cause two kinds of failure. The device may not power on at all because the current cannot flow. Or it may work for a while and then cut out, because vibration or temperature changes shift the battery slightly and break the contact. This is especially common in devices you carry or move around, like remote controls or portable scales.
When you might get away with it
Devices with spring-loaded battery compartments sometimes have enough give that a thinner battery still makes contact. Older remote controls and some children's toys fall into this category. But there is no way to know before you try, and the risk is that your device stops working at an inconvenient moment.
Even if a CR2025 works in your device, it will not last as long as a CR2032. The CR2032 has more chemical material inside because of its extra thickness, so it holds more charge. You would be paying the same price for a battery that works worse and dies sooner.
What to do if you cannot find the right battery
If your device needs a CR2032 and you only have a CR2025 on hand, check the device manual or the battery compartment itself. The correct battery type is usually printed on a label inside the compartment or on the back of the device. Take a photo of that label and search for the battery online or at a pharmacy, electronics store, or supermarket. CR2032 batteries are common and inexpensive — usually between one and three dollars each.
If you are in a genuine emergency and cannot wait, you can try the CR2025 as a temporary measure. But do not rely on it for anything important. Replace it with the correct battery as soon as you can.
The difference between CR2025 and CR2032 at a glance
| Battery Type | Diameter | Thickness | Common Uses |
|---|---|---|---|
| CR2025 | 20 mm | 2.5 mm | Watches, small calculators, hearing aid batteries |
| CR2032 | 20 mm | 3.2 mm | Remote controls, fitness trackers, car key fobs, scales |
How to check which battery your device needs
Open the battery compartment on your device. Look for a label or marking that says CR2025, CR2032, or another battery code. If you see a marking, that is the battery you need. If there is no label, check the device manual or the manufacturer's website by searching for your device model and the word "battery."
You can also measure the battery compartment with a ruler if you have one. Measure the depth of the slot where the battery sits. If it is about 2.5 millimeters deep, you need a CR2025. If it is about 3.2 millimeters deep, you need a CR2032. This is not always precise because compartments have some extra space, but it gives you a good starting point.
Frequently Asked Questions
Will a CR2025 damage my device if I use it?
No, using a CR2025 in a CR2032 slot will not damage the device or the battery. The worst that happens is the device does not work or works poorly. Once you replace it with the correct battery, the device will function normally again.
Can I stack two CR2025 batteries to make up for the thickness?
No. Stacking batteries changes the voltage and can damage the device or create a safety hazard. Always use the single battery type your device is designed for.
Is a CR2032 more expensive than a CR2025?
They usually cost about the same — typically one to three dollars each. Price varies by brand and where you buy, but the thickness difference does not make one significantly more expensive than the other.
What if my device works fine with a CR2025 right now?
It may continue to work, but you are risking intermittent failures later. The connection is weaker than it should be, and vibration or temperature changes can break it. Replace it with the correct battery to avoid problems down the road.
Are CR2025 and CR2032 the same voltage?
Yes, both are 3-volt lithium batteries. The voltage is the same; only the capacity (how long they last) differs because of the thickness difference.