What battery is equivalent to SR920SW?

371, SR69, SG6, AG6, D371, V371, and SB-AN are all equivalent to SR920SW. For watches, always use silver oxide (SR920SW / 371) rather than alkaline for accurate timekeeping and longer battery life.

What watches use SR920SW?

SR920SW (371) is the second most common watch battery in the world. It is used in many mid-size quartz watches from Citizen, Seiko, Casio, Bulova, Orient, and Hamilton.

SR920SW Battery Equivalent

Q: Is SR920SW the same as 371?

Yes — SR920SW and 371 are exactly the same battery. SR920SW is the IEC standard code, 371 is the common trade name used by brands like Renata, Energizer, Duracell and Varta.

Q: What is the difference between 370 and 371?

370 (SR920W) is the high-drain version and 371 (SR920SW) is the low-drain version. Both are the same physical size (9.5mm x 2.1mm). Modern multi-drain 371 cells from Renata, Energizer and Duracell safely replace both 370 and 371.

SR920SW / 371

The second most common watch battery

SR920SW and 371 are exactly the same battery. It is the second most widely used watch battery in the world, powering many mid-size quartz watches from Citizen, Seiko, Casio, Bulova, Orient, and Hamilton. Silver oxide chemistry gives it a flat 1.55V discharge curve for accurate timekeeping throughout its life.

Voltage

1.55V

Chemistry

Silver Oxide

Dimensions

9.5mm diameter × 2.1mm thick

Typical battery life

2–4 years in a watch

Is SR920SW the same as 371?

Yes — SR920SW and 371 are exactly the same battery. SR920SW is the IEC technical standard code. 371 is the common trade name used by Renata, Energizer, Duracell, Varta and Sony. You will find them sold under both names — either works perfectly in your watch.

All SR920SW / 371 equivalents

Battery code	Type	Compatible?
371	Silver oxide	✓ Direct replacement
SR920SW	Silver oxide	✓ Direct replacement
SR69	Silver oxide	✓ Direct replacement
SG6	Silver oxide	✓ Direct replacement
D371	Silver oxide	✓ Direct replacement (Duracell)
V371	Silver oxide	✓ Direct replacement (Varta)
SB-AN	Silver oxide	✓ Direct replacement (Seiko)
280-31	Silver oxide	✓ Direct replacement (Citizen)
370	Silver oxide	✓ Direct replacement — high-drain version, modern multi-drain 371 replaces both
SR920W	Silver oxide	✓ Direct replacement — high-drain variant, modern multi-drain 371 replaces both
AG6	Alkaline	⚠ Same size but alkaline — use silver oxide for watches
LR920	Alkaline	⚠ Same size but alkaline — use silver oxide for watches

What is the difference between 370 and 371?

370 and 371 are the same physical size — the difference is drain rate. The 371 (SR920SW) uses sodium hydroxide electrolyte and is optimised for low-drain analog watches. The 370 (SR920W) uses potassium hydroxide and handles higher drain from backlights, alarms or digital displays. Both are 9.5mm × 2.1mm and 1.55V. Modern multi-drain cells from Renata, Energizer, and Duracell now cover both applications — a single 371 safely replaces both 370 and 371 in any watch.

Silver oxide vs alkaline — does it matter?

Always use silver oxide (SR920SW / 371) in watches — not alkaline (AG6 / LR920). Although they are the same physical size, alkaline batteries have a declining voltage curve — your watch will run slower and slower as the battery drains. Silver oxide maintains a steady 1.55V until nearly depleted, giving accurate timekeeping and longer life. The price difference is minimal and well worth it.

Watches that use SR920SW / 371

Citizen Many Citizen analog quartz watches including Eco-Drive models with movement calibers using 371

Seiko Many mid-size Seiko quartz watches — check caseback for exact caliber

Casio Many Casio analog and combination watches — check module number

Bulova Many Bulova analog quartz dress watches

Orient Many Orient analog quartz watches

Hamilton Several Hamilton quartz dress watch models

Tissot Some Tissot quartz models — verify with caseback code

Longines Some Longines quartz models — verify with caseback code

Always check the battery inside your watch for the exact code — some models use SR626SW (377) or other sizes. If unsure, a jeweller can confirm without replacing the battery.

How to check your watch battery code

The safest way is to open the caseback and look at the existing battery — the code is printed on the top. Alternatively, many watches have a caliber or module number engraved on the caseback. A quick search for your watch model and "battery" will usually confirm the exact size.

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