CR2354 vs CR2450
The CR2354 and CR2450 are both tall 3 volt lithium coin cells with serious capacity for their size. The CR2354 is 23 mm across and 5.4 mm high, rated about 560 mAh. The CR2450 is 24.5 mm across and 5 mm high, at 550 to 620 mAh. Similar energy, different cases, no swapping.
| CR2354 | CR2450 | |
|---|---|---|
| Chemistry | Lithium manganese dioxide (Li/MnO2) | Lithium manganese dioxide (Li/MnO2) |
| Voltage | 3 V | 3 V |
| Diameter | 23 mm | 24.5 mm |
| Height | 5.4 mm | 5 mm |
| Capacity | 560 mAh | 550-620 mAh |
| Also sold as | DL2354 | DL2450, ECR2450, CR2450N (Renata, flanged) |
Capacity is the red herring in this pairing. About 560 mAh against 550 to 620 puts the two within a rounding error of each other on paper, which is exactly why they get cross-ordered. The cases disagree. The CR2354 measures 23 by 5.4 mm and the CR2450 measures 24.5 by 5, so there is 1.5 mm of width and 0.4 mm of height between them. That is more than enough to keep each one out of the other's compartment.
The detail that decides it is underneath. The CR2354 has a stepped, recessed base on its negative side, and devices designed for it use that geometry to make contact. A flat-bottomed CR2450 pushed into a CR2354 holder either fails to seat or bears on the contacts in a way they were never built for. The reverse is no more promising, since a CR2354 is narrower than a CR2450 bay and cannot locate properly in it. Read the code stamped on the cell you removed, and buy that code.
The two sizes lead different lives on the shelf. The CR2450 is the retail one, fitted to LED candles and tealights, BMW and Land Rover fobs, Bosch bike sensors, thermostats, meat thermometers and glucose sensor transmitters, and a supermarket will have it. Watch for Renata's flanged CR2450N, whose wider lip some holders require and others cannot close over: if an N came out, put an N back. The CR2354 serves Polar heart rate monitors, bike computers and appliance timer backup, with Panasonic as the reference maker, and it usually has to be ordered. On the big coins generally, unbranded cells carry optimistic capacity claims, and in a device drawing current continuously a name-brand cell commonly doubles the runtime.