What is a LR43 battery?

LR43 is a 1.5-volt alkaline button cell (about 11.6 × 4.2 mm). AG12 is a common pack label. SR43 / 301 / 386 is the silver-oxide size family — prefer silver when a watch OEM names SR.

What do the letters in LR43 mean?

L is the IEC-assigned code for alkaline manganese (not a spelling shortcut), and R means round. Same size with an SR prefix is silver oxide — different chemistry, not an automatic swap. Full guide: CR vs LR vs SR.

What is LR43 also called?

LR43 pack labels and aliases on this site include AG12, LR1142, 186. These are names for the same battery entity — not chemistry substitutes.

Battery

LR43

1.5V alkaline button cell

LR1142 is a pack label for LR43 — same battery, different name on the package.

Chemistry: alkaline
Voltage: 1.5 V
Diameter: 11.6 mm
Thickness: 4.2 mm
Used by: 0 devices

Common uses: Watches · Small electronics

Common questions

What is a LR43 battery?: LR43 is a 1.5-volt alkaline button cell (about 11.6 × 4.2 mm). AG12 is a common pack label. SR43 / 301 / 386 is the silver-oxide size family — prefer silver when a watch OEM names SR.
What do the letters in LR43 mean?: L is the IEC-assigned code for alkaline manganese (not a spelling shortcut), and R means round. Same size with an SR prefix is silver oxide — different chemistry, not an automatic swap. Full guide: CR vs LR vs SR.
What is LR43 also called?: LR43 pack labels and aliases on this site include AG12, LR1142, 186. These are names for the same battery entity — not chemistry substitutes.

Other names

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

AG12 · LR1142 · 186

Related codes

No related codes listed yet.

Size family

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

1.65 mm

2.1 mm

2.1 mm

3.1 mm

3.1 mm

3.6 mm

4.2 mm

4.2 mm

5.4 mm

5.4 mm

5.4 mm

5.4 mm

Devices using LR43

No devices listed for this battery yet.

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.

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Need a LR43?

Search Amazon for packs of this battery code.

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Notes

Alkaline twin of SR43-class size. Prefer silver oxide in watches when the OEM specifies SR.