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CR1620 vs CR1632: are they the same?

Both are 3V coin cells 16 mm across, but a CR1632 is 3.2 mm thick and a CR1620 2 mm. They aren't interchangeable: fit the one your device takes.

CR16203VCR1620CR16323VCR1632
CR1620CR1632
Diameter16 mm16 mm
Thickness2 mm3.2 mm
Voltage3V3V
Also sold asDL1620, ECR1620, KECR1620DL1632, ECR1632, KECR1632
Devices here2211

Source: Varta CR1620 datasheet, Varta CR1632 datasheet

Some devices that take a CR1620

All 22 on the CR1620 page

Some devices that take a CR1632

All 11 on the CR1632 page