CR2354 lithium coin cells are rather unusual and can be hard to find.
There are 2 distinct types:
Polar heart rate monitors have a contoured recess that fits the tapered shape of the Panasonic version of the CR2354.
Other manufacturers versions do not taper and will not fit the heart monitors but are fine for all other applications.
BR2354, CR2354, DL2354, ECR2354, E-CR2354, KCR2354, KECR2354, KL2354, L2354,
not to scale.
Diameter × Thickness.
|Chemical Composition.||Nominal Voltage.|
|CR2354.||23 mm × 5.4 mm|