What is a LR57 battery?

LR57 is a 1.5-volt alkaline button cell (about 9.5 × 2.7 mm). AG7 is a common pack label. SR927SW / 395 is the silver-oxide size family — prefer silver when a watch OEM names SR.

What do the letters in LR57 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 LR57 also called?

LR57 pack labels and aliases on this site include AG7, LR926. These are names for the same battery entity — not chemistry substitutes.

Battery

LR57

1.5V alkaline button cell

AG7 is a pack label for LR57 — same battery, different name on the package.

Chemistry: alkaline
Voltage: 1.5 V
Diameter: 9.5 mm
Thickness: 2.7 mm
Used by: 0 devices

Common uses: Small electronics

Common questions

What is a LR57 battery?: LR57 is a 1.5-volt alkaline button cell (about 9.5 × 2.7 mm). AG7 is a common pack label. SR927SW / 395 is the silver-oxide size family — prefer silver when a watch OEM names SR.
What do the letters in LR57 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 LR57 also called?: LR57 pack labels and aliases on this site include AG7, LR926. 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.

AG7 · LR926

Related codes

Same size, different battery

LR57SR927SW

Same size, different type

Silver SR927 vs alkaline AG7/LR57

Size family

Edge thickness in the 9.5 mm family — thicker bar means thicker cell. Not to scale. Highlighted cell is this page.

1.65 mm

2.1 mm

2.7 mm

2.7 mm

3.6 mm

Devices using LR57

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 LR57?

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Notes

Alkaline AG7 — shop twin of SR927 silver. Not a drop-in for silver-specified watches.