CR vs BR batteries
Both are 3 V lithium coin cells in shared sizes. CR (lithium manganese dioxide) has more capacity and better pulse current; BR (lithium carbon monofluoride) tolerates heat and long storage.
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Both are 3 volt lithium coin cells and both come in the same sizes, so a BR2032 and a CR2032 are the same shape. The difference is the chemistry inside. CR is the standard type: more capacity and better at delivering short bursts of current, which is what a car key or a sensor needs. BR handles much higher temperatures and loses less charge over many years, which is why it turns up in industrial and automotive electronics. For consumer devices, CR is nearly always the right answer.
- Verdict:
- CR for everyday use, BR for heat and long-term stability
Side by side
| Specification | CR | BR |
|---|---|---|
| Chemistry | Lithium manganese dioxide | Lithium carbon monofluoride |
| Nominal voltage | 3 V | 3 V |
| Capacity | Higher | Lower |
| Pulse current | Better | Limited |
| Temperature range | About −20 to 70 °C | About −30 to 125 °C |
| Self-discharge | Low | Very low |
| Typical use | Key fobs, motherboards, sensors | Automotive, industrial, high heat |
Substituting one for the other
A BR will physically fit any CR slot of the same number and the voltage matches, but it cannot supply the same short bursts of current. In a key fob that transmits in pulses, a BR can read as flat while still holding charge. Going the other way, a CR in a hot engine bay will not last.
Why BR exists
Carbon monofluoride is stable at temperatures that would degrade a CR cell, and loses very little charge per year. For a component sealed inside a car for a decade, that matters more than capacity.
What you will actually find
Shops stock CR almost exclusively. If a device specifies BR it is usually industrial, and the specification is deliberate rather than incidental.
How to tell if a device needs BR
It will say so, usually in a specification table rather than on the battery door, and usually because the device lives somewhere hot. Consumer equipment essentially never specifies BR, so if you cannot find a reference, your device wants a CR.
Substituting in an emergency
A CR in a BR socket will work at room temperature and simply have a shorter life in heat. A BR in a CR socket is the riskier direction: it holds less and cannot supply the same pulse, so a key fob or a sensor may behave as though the battery is failing from the start.
Neither is rechargeable
Both are primary lithium cells. Rechargeable coin cells exist — usually marked LIR, as in LIR2032, and running at 3.6 V rather than 3 — and they are a different part again. An LIR is not a drop-in for a CR in a device expecting 3 V.
Check before you swap. Batteries with similar dimensions are not always interchangeable. Always verify voltage, chemistry and the requirements printed in your device manual before fitting a replacement.
Cells mentioned here
CR vs BR batteries: common questions
What is the difference between CR and BR?
Both are 3 volt lithium coin cells and both come in the same sizes, so a BR2032 and a CR2032 are the same shape. The difference is the chemistry inside. CR is the standard type: more capacity and better at delivering short bursts of current, which is what a car key or a sensor needs. BR handles much higher temperatures and loses less charge over many years, which is why it turns up in industrial and automotive electronics. For consumer devices, CR is nearly always the right answer.
Which should I choose, CR or BR?
CR for everyday use, BR for heat and long-term stability. Both are 3 V lithium coin cells in shared sizes. CR (lithium manganese dioxide) has more capacity and better pulse current; BR (lithium carbon monofluoride) tolerates heat and long storage.
Chemistry — how do they compare?
CR: Lithium manganese dioxide. BR: Lithium carbon monofluoride.