Find the Right Battery for Your Watch

Free watch battery finder. Pick a brand and type your model (or Casio module number) to see the exact replacement battery — CR2016, SR626SW, LR44, CR1220 and dozens of other common cells. A full size chart below shows voltage, diameter and height so you can cross-reference any battery code you already have.

How to find your watch battery

1
Open the back of the watch (optional)

If accessible, the battery often has its code printed directly on it — that is always the authoritative answer.

2
Pick your brand

Choose Casio, Seiko, Citizen, Timex, etc. to narrow the search.

3
Type the model or module

e.g. "F-91W", "DW-5600" or the Casio module number ("3229").

4
Read the battery code

The right column shows the battery type plus any common equivalents (SR626SW / 377).

5
Cross-check on the battery itself

Before ordering, confirm the code stamped on the physical cell. Production batches sometimes differ.

Look up the exact battery (CR2016, SR626SW, 377 and more) for popular Casio, Seiko, Citizen, Timex, Tissot, Swatch and Fossil models.

🔍 Search by model

📘 Battery types and sizes

Battery Equivalents Voltage Size Typical use
SR626SW / 377 377, SR626SW, AG4, 626, SR66 1.55V ⌀6.8 mm × 2.6 mm Most analog dress watches
SR626W / 376 376, SR626W, 626 1.55V ⌀6.8 mm × 2.6 mm Some low-drain analog quartz
SR621SW / 364 364, SR621SW, AG1, 621 1.55V ⌀6.8 mm × 2.1 mm Slim/dress watches
SR920SW / 371 371, SR920SW, AG6, 920 1.55V ⌀9.5 mm × 2.1 mm Chronographs, mid-drain quartz
SR726SW / 396 396, SR726SW, AG2, 726 1.55V ⌀7.9 mm × 2.6 mm Mid-size analog quartz
SR927W 395, SR927SW, SR927W, AG7 1.55V ⌀9.5 mm × 2.6 mm Edifice and similar chronographs
SR521SW / 379 379, SR521SW, AG0, 521 1.55V ⌀5.8 mm × 2.1 mm Thin ladies watches
SR726W 397, SR726SW, AG2 1.55V ⌀7.9 mm × 2.6 mm Baby-G and similar
LR44 / AG13 LR44, AG13, A76, 357A, 303 1.5V ⌀11.6 mm × 5.4 mm Budget Casio digitals (A158/A168)
CR1220 CR1220, BR1220 3V ⌀12.5 mm × 2.0 mm G-Shock GA-100/GA-110
CR2016 CR2016, BR2016, DL2016 3V ⌀20.0 mm × 1.6 mm Most Casio digital watches (F-91W, DW-5600)
CR2025 CR2025, BR2025, DL2025 3V ⌀20.0 mm × 2.5 mm Casio AE-1200, Ironman classic
CR2032 CR2032, BR2032, DL2032 3V ⌀20.0 mm × 3.2 mm Larger digitals, some fitness trackers
MT621 MT621 (Panasonic) 1.55V ⌀6.8 mm × 2.1 mm Seiko Solar V157 (NOT user-replaceable)
MT920 MT920 (Panasonic) 1.55V ⌀9.5 mm × 2.1 mm Seiko Solar V172 (NOT user-replaceable)
CTL1616 CTL1616 (Panasonic) 1.55V ⌀16.0 mm × 1.6 mm Casio solar (G-Shock tough solar) — NOT user-replaceable
SR516SW / 317 317, SR516SW, AG0, 516 1.55V ⌀5.8 mm × 1.65 mm Swatch Skin and similar ultra-thin watches
SR731SW / 329 329, SR731SW, AG3, 731 1.55V ⌀7.9 mm × 3.1 mm Swatch Lady and small ladies' watches
SR1130SW / 390 390, SR1130SW, AG10, 1130, 389/390 1.55V ⌀11.6 mm × 3.1 mm Swatch Gent, New Gent and Pop plastic lines
SR936SW / 394 394, SR936SW, AG9, 936 1.55V ⌀9.5 mm × 3.6 mm Swiss quartz chronographs (ETA G10.211, VK64A mecha-quartz)
SR926SW / 399 399, SR926SW, AG2, 926, 373/399 1.55V ⌀9.5 mm × 2.6 mm Vintage Seiko LCD chronographs (A229, A259)
SR41 / 392 392, SR41SW, SR736W, AG3, 384, LR41 (alkaline) 1.55V ⌀7.9 mm × 3.6 mm Vintage Seiko Voice Master and small button-cell watches
⚠️
Confirm the battery code printed on your watch cell before purchase. Different production batches of the same model occasionally ship different calibres. Solar and automatic watches contain rechargeable cells or no battery — take them to a service centre rather than a drug store.

Features

50+ popular models indexed Automatic and solar flagged Complete battery size chart

Frequently asked questions

My model is not in the list — what now?

Most analog quartz watches use SR626SW (code 377), SR621SW (364) or SR920SW (371 for chronographs). Most plastic digital watches use CR2016 or CR2025. The safest way is to open the case back (if user-serviceable) and read the code printed on the battery itself.

What do SR and CR mean?

SR = silver-oxide cell (1.55V, stable voltage until depletion — ideal for watches). CR = lithium cell (3V, higher capacity — used in digital Casios with backlights). LR = alkaline (1.5V, cheaper but voltage drops earlier). Never swap SR for LR in a precision analog movement — the lower voltage can keep time incorrectly.

Does "SR626SW" mean the same as "377"?

Yes. Watch battery codes are assigned independently by several standards — IEC (SR626SW), Energizer (377), Renata, Maxell and others. The physical cell is identical; your local shop may stock whichever label is common in your region.

Why can't I replace a solar-rechargeable cell myself?

Solar cells (Citizen Eco-Drive, Seiko Solar, Casio Tough Solar) use specialised rechargeable cells like MT621, MT920 or CTL1616. They require correct polarity, insulation of the charging circuit and sometimes a capacitor reset. A regular button cell will destroy the solar panel circuit. Always visit a service centre.

How long does a watch battery last?

Typical life is 2–4 years for analog quartz, 5–10 years for efficient Casio digitals (like F-91W or G-Shock), and 10+ years for high-accuracy quartz. Chronographs burn batteries faster — often 12–24 months. Low-temperature environments shorten life by 20–30 %.

Is it safe to use a CR2025 instead of a CR2016?

The CR2025 is taller (2.5 mm vs 1.6 mm). If the case has room it will last ~55 % longer (165 vs 90 mAh) but the tighter cell spring in some F-91W variants will not close properly. Test-fit before committing — do not force a case back shut.

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Who is this tool for?
💍 Jewelry & Watches
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