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Battery

SR44

1.55V silver oxide button cell

1131SO is a pack label for SR44 — same battery, different name on the package.

Chemistry: silver_oxide
Voltage: 1.55 V
Diameter: 11.6 mm
Thickness: 5.4 mm
Used by: 6 devices

Common uses: Watches · Cameras · Calipers · Light meters

SR44 Diagram

Brand-neutral outline — confirm the tray in your device.

Other names

Genuine aliases and pack labels for this battery — not substitutes of a different chemistry.

357 · 303 · SR44W · SR44SW · SR1154 · SG13 · D357 · V357 · 1131SO

Related codes

Same battery / other names

Same battery

Same battery, different label.

SR44SR44SW

Same battery

Same battery, different label.

SR44SG13

Same battery

Same battery, different label.

Same battery

Same battery, different label.

SR44D357

Same battery

Same battery, different label.

SR44V357

Same battery

Same battery, different label.

SR44SR44W

Same battery

Same battery, different label.

SR44SR1154

Same battery

Same battery, different label.

Same size, different battery

Same size, different type

Fits the same slot. Different type — check the manual.

Commonly confused with

Not a substitute

One CR1/3N can replace two SR44 only when the device manual lists the lithium option

Rechargeables are not equivalents

Do not substitute a rechargeable cell unless the device documentation explicitly allows it. Silver-oxide and lookalike chemistries are not interchangeable with rechargeables by size alone.

Size family

Edge thickness in the 11.6 mm family — thicker bar means thicker cell. Not to scale. Highlighted cell is this page.

3.1 mm

3.1 mm

4.2 mm

5.4 mm

5.4 mm

5.4 mm

Device-specific caveats

From manufacturer-backed notes on devices that use SR44 — not generic advice.

Keep button cells away from children.
Do not use 1.35V mercury MR44 / PX625-class cells; the manual forbids mercury lookalikes.

Devices using SR44

6

All (6)Film cameras (4)Measuring tools (1)Cycling & fitness (1)Pentax (2)

Used in

Film cameras4 devices Measuring tools1 device Cycling & fitness1 device

Brands: Pentax

Compare

LR44 vs SR44Compare

Learn more

Testers & chargers

Optional tools that fit this cell type — only where the chemistry allows. Separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Coin cell / button cell battery tester
Quick check of CR / LR / SR button and coin cells before fitting
Buy on Amazon More tools
ZTS Mini-MBT Multi-Battery Tester
More informative state-of-charge style checks across common formats
Docs Buy on Amazon More tools
BT-168D-class digital battery tester
Budget household go/no-go checks
Buy on Amazon More tools

Coin / button cell tester
Quick check for CR / LR / SR coin cells
Open-circuit voltage alone does not prove remaining capacity.
How to test a coin cell Buy on Amazon

Buy links are optional and separate from the battery answer.

Need one?

Need a SR44?

Search Amazon for packs of this battery code.

Buy on Amazon Amazon UK

Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.

Notes

Prefer over alkaline LR44 where stable voltage matters. 357 is the common US/watch-trade label.