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Comparison

CR2450 vs CR2477

The CR2450 and CR2477 are the two heavyweights of the 24.5 mm lithium coin family, both 3 volts. The CR2450 is 5 mm thick with 550 to 620 mAh. The CR2477 is 7.7 mm thick with a full 1000 mAh. Same footprint, very different height, so they rarely interchange.

CR2450 and CR2477 drawn side by side at the same scale: CR2450 is 24.5 mm across, 5 mm thick; CR2477 is 24.5 mm across, 7.7 mm thickCR2450CR2477 CR2450 3V + ⌀ 24.5 mm 5 mm CR2477 3V + ⌀ 24.5 mm 7.7 mm
CR2450 vs CR2477 at the same scale: 24.5 mm across, 5 mm thick against 24.5 mm across, 7.7 mm thick.
CR2450CR2477
ChemistryLithium manganese dioxide (Li/MnO2)Lithium manganese dioxide (Li/MnO2)
Voltage3 V3 V
Diameter24.5 mm24.5 mm
Height5 mm7.7 mm
Capacity550-620 mAh1000 mAh
Also sold asDL2450, ECR2450, CR2450N (Renata, flanged)DL2477, CR2477N (Renata, flanged)

The CR2450 is the retail one. It powers flameless candles, premium key fobs, wireless sensors, thermostats, meat thermometers and glucose sensor transmitters, and you can buy it in a supermarket. The CR2477 is the industrial one, built for devices that must run unattended for years: asset tracking tags, IoT beacons, utility meters and long-life tealights. At the 10 to 20 microamp average drain typical of a beacon, a CR2477 runs five years or more.

Because the diameter matches, the temptation is to treat them as swappable. The 2.7 mm height gap says otherwise. A CR2477 will not fit a compartment moulded for a 5 mm cell, and a CR2450 in a CR2477 holder usually sits too low for reliable contact. Check the number stamped on the cell rather than the diameter you can see.

Both sizes have a flanged variant, written with an N, where a wider lip on the negative side keys into certain holders. Some holders require the flange and others cannot accept it, so if an N came out, put an N back in. Buying notes also differ: the CR2450 appears in cheap candle multipacks with optimistic capacity claims, while the CR2477 is mostly sold through electronics distributors.

All about CR2450 All about CR2477

Frequently asked questions

Can a CR2477 replace a CR2450?
Only if the compartment has 2.7 mm of spare height, which is rare, since devices choose the thinner cell to keep the housing slim. Where it does physically fit and make contact, the CR2477 supplies the same 3 volts with roughly 60 percent more capacity.
Why is the CR2477 so hard to find in shops?
It is an industrial part. Most of its demand comes from asset trackers, beacons and meters bought by businesses, not from consumers replacing a key fob battery. Order it from an electronics distributor, and prefer an established brand, since capacity claims on unbranded large coins are often optimistic.
What does the N mean on a CR2450N or CR2477N?
It marks a flanged version with a wider lip on the negative side. Some battery holders are built around that lip and some cannot close over it. The safest rule is to replace like with like: if the cell you removed has an N, buy an N.

⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.