CR2032 vs BR2032
The CR2032 and BR2032 are the same size and voltage: 20 mm across, 3.2 mm thick, 3 volts. The chemistry differs. The CR uses lithium manganese dioxide for 220 to 240 mAh, while the BR uses lithium carbon monofluoride for about 190 mAh with a much wider temperature range.
| CR2032 | BR2032 | |
|---|---|---|
| Chemistry | Lithium manganese dioxide (Li/MnO2) | Lithium carbon monofluoride (Li/CFx) |
| Voltage | 3 V | 3 V |
| Diameter | 20 mm | 20 mm |
| Height | 3.2 mm | 3.2 mm |
| Capacity | 220-240 mAh | 190 mAh |
| Also sold as | DL2032, ECR2032, 5004LC, KCR2032 | – |
The BR2032 exists for places a CR2032 would struggle. Its carbon monofluoride chemistry works from roughly minus 30 to plus 80 degrees C and self-discharges exceptionally slowly, which is why engineers specify it for automotive modules, tire pressure sensors, industrial memory backup and gear that lives outdoors year round. The trade is capacity and pulse current: the CR2032 supplies both more readily, which is why it dominates consumer electronics.
Voltage behaviour is the other practical difference. A BR2032 runs a slightly lower plateau under load, around 2.8 volts. Memory backup circuits tolerate that happily. Some consumer devices read it as a weak battery and complain, even though the cell is fine and will hold that plateau for a long time.
Swap direction matters more than the swap itself. Putting a BR2032 into a CR2032 socket gives you a lower, longer, lower-current supply, which is usually harmless in a low-drain device. Putting a CR2032 into a socket that specified a BR risks heat failure in the environment the BR was chosen for. If the old cell says BR, buy BR.