Battery

SR43

1.55V silver oxide button cell

SR43W is a pack label for SR43 — same battery, different name on the package.

Chemistry: silver_oxide
Voltage: 1.55 V
Diameter: 11.6 mm
Thickness: 4.2 mm
Used by: 1 device

Common uses: Fitness trackers · Watches

SR43 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.

SR43W · SR43SW · 301 · 386 · SR1142

Related codes

Commonly confused with

SR43PX625

Not a substitute

MR-9 adapters often take silver-oxide 386 / SR43W — not a bare drop-in for PX625 without the adapter

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

Devices using SR43

Garmin vívofit 4Connected wearables · vívofit · Featured

Used in

Connected wearables1 device

Compare

PX625 replacement optionsCompare

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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 SR43?

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

Garmin vívofit 4 manuals state 301 and 386 are equivalent to SR43. Not interchangeable with thicker SR44/357.