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Reference guide

Battery equivalents: every button, coin and household battery, and what else it’s called.

The same battery is sold under half a dozen names. Type the code off the old one — 357, AG13, CR2032, 23A — and this page shows every other name it goes by, its real size drawn to scale, and the lookalikes that fit the slot but shouldn’t go in. 51 sizes, 330 codes.

By John Walsh-Green & the friendly AI team at Digital Greenhouse 14 October 2026 Reference

Lithium coin cells (3 V)

The flat silver discs in car keys, remotes and motherboards. The name is the size: CR2032 is 20 mm across and 3.2 mm thick. DL (Duracell) and ECR (Energizer) are the same cells with a brand prefix. BR is a different lithium chemistry in the same size and voltage: a little less capacity and current, but better at high temperatures and in long storage, so it is a fine swap in low-drain devices like remotes, keys and clocks.

Every drawing in this section is at the same scale: the face on the left, the edge on the right.

CR2032

3 V · Lithium (3 V)

Lithium CR2032 DL2032 ECR2032 5004LC

Same size, other lithium chemistry BR2032

Size: 20 mm across, 3.2 mm thick
Capacity: ≈ 220–240 mAh
Used in: Car keys and remotes, computer motherboards (the BIOS clock battery), kitchen and bathroom scales, AirTag, fitness trackers, glucose meters, small torches.

One of the most common coin cells. Coin cells are named by their size: 20 mm across, 3.2 mm thick.

CR2025

3 V · Lithium (3 V)

Lithium CR2025 DL2025 ECR2025 5003LC

Same size, other lithium chemistry BR2025

Size: 20 mm across, 2.5 mm thick
Capacity: ≈ 150–170 mAh
Used in: Car keys, TV and audio remotes, calculators, watches, small LED lights.

Same width as a CR2032 but 0.7 mm thinner, and holds roughly two-thirds the charge. See the FAQ on swapping the two.

CR2016

3 V · Lithium (3 V)

Lithium CR2016 DL2016 ECR2016 5000LC

Same size, other lithium chemistry BR2016

Size: 20 mm across, 1.6 mm thick
Capacity: ≈ 80–90 mAh
Used in: Thin car keys, watches, calculators, some fitness trackers and heart-rate straps.

Some devices take two CR2016s stacked, for 6 V. A single CR2032 is the same thickness but only 3 V, so it is not a substitute for the pair.

CR2450

3 V · Lithium (3 V)

Lithium CR2450 DL2450 ECR2450 5029LC

Same size, other lithium chemistry BR2450

Size: 24.5 mm across, 5 mm thick
Capacity: ≈ 540–620 mAh
Used in: Some MINI and BMW car keys, smart-home sensors, wireless door chimes, bike computers, tyre-pressure sensors.

The heavy-duty coin cell: about two and a half times the charge of a CR2032.

CR2430

3 V · Lithium (3 V)

Lithium CR2430 DL2430 ECR2430 5011LC

Same size, other lithium chemistry BR2430

Size: 24.5 mm across, 3 mm thick
Capacity: ≈ 270–300 mAh
Used in: Car keys, bike lights and computers, some scales and remotes.

Easily mistaken for a CR2450, which is the same width but 2 mm thicker.

CR2477

3 V · Lithium (3 V)

Lithium CR2477

Size: 24.5 mm across, 7.7 mm thick
Capacity: ≈ 1000 mAh
Used in: Long-life sensors, security tags and industrial meters.

The thickest of the 24.5 mm coin family. Rarely in shops; order online by the full code.

CR3032

3 V · Lithium (3 V)

Lithium CR3032

Size: 30 mm across, 3.2 mm thick
Capacity: ≈ 500 mAh
Used in: Some car keys, medical devices and data loggers.

Much wider than a CR2032 with the same thickness.

CR1632

3 V · Lithium (3 V)

Lithium CR1632 DL1632 ECR1632

Size: 16 mm across, 3.2 mm thick
Capacity: ≈ 130–140 mAh
Used in: Car keys and remotes (common in Toyota keys), tyre-pressure sensors.

16 mm across, 3.2 mm thick. Don’t confuse it with the CR1620, which is the same width but thinner.

CR1620

3 V · Lithium (3 V)

Lithium CR1620 DL1620 ECR1620 5009LC

Size: 16 mm across, 2 mm thick
Capacity: ≈ 70–80 mAh
Used in: Car keys, small remotes, calculators, some watches.

CR1616

3 V · Lithium (3 V)

Lithium CR1616 DL1616 ECR1616 5021LC

Size: 16 mm across, 1.6 mm thick
Capacity: ≈ 50–55 mAh
Used in: Thin car keys, watches, small remotes.

CR1225

3 V · Lithium (3 V)

Lithium CR1225 DL1225

Same size, other lithium chemistry BR1225

Size: 12.5 mm across, 2.5 mm thick
Capacity: ≈ 50 mAh
Used in: Tyre-pressure sensors, small medical devices, some watches and memory backup.

CR1220

3 V · Lithium (3 V)

Lithium CR1220 DL1220 ECR1220 5012LC

Same size, other lithium chemistry BR1220

Size: 12.5 mm across, 2 mm thick
Capacity: ≈ 35–40 mAh
Used in: Laser pointers, small torches, keyless-entry fobs, the clock battery in some laptops and cameras.

CR927

3 V · Lithium (3 V)

Lithium CR927

Size: 9.5 mm across, 2.7 mm thick
Capacity: ≈ 30 mAh
Used in: LED fishing floats, light-up toys and small novelty lights.

Named the same way, just with a single-digit width: 9.5 mm across, 2.7 mm thick.

Watch & button cells (1.5 V)

The small button cells come in two chemistries that fit the same holders: alkaline (codes starting LR or AG, 1.5 V, cheaper) and silver oxide (SR, or watch numbers like 377 and 357, 1.55 V). Silver oxide lasts longer and holds a steady voltage until it is nearly flat, so it is the one to buy for watches, calipers and cameras. Alkaline is fine for toys and calculators.

Watch numbers come in pairs: one is made for high-drain watches (with alarms, lights or a digital display, marked W) and one for low-drain analogue watches (SW). Either fits; the right one lasts longer.

Every drawing in this section is at the same scale, larger than the coin-cell section.