Battery

LR41

1.5V alkaline button cell

LR41 is a small 1.5V alkaline button cell (also AG3 / 192). LEGO light bricks take two LR41 cells. Silver-oxide SR41 is the same size family but a different chemistry — see SR41 vs LR41. Keep button cells away from children.

Chemistry: alkaline
Voltage: 1.5 V
Diameter: 7.9 mm
Thickness: 3.6 mm
Used by: 3 devices

Common uses: Thermometers · Toys · Small instruments

LR41 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.

AG3 · LR736 · 192 · G3A

Related codes

Same battery / other names

LR41AG3

Same battery

Same battery, different label.

LR41192

Same battery

Same battery, different label.

LR41G3-A

Same battery

Same battery, different label.

LR41LR736

Same battery

Same battery, different label.

Same size, different battery

LR41SR41

Same size, different type

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

Size family

Edge thickness in the 7.9 mm family — thicker bar means thicker cell. Not to scale. Highlighted cell is this page.

3.6 mm

3.6 mm

3.6 mm

5.4 mm

Device-specific caveats

From manufacturer-backed notes on devices that use LR41 — not generic advice.

Medical device: button-cell swallowing hazard — keep cells away from children.

Devices using LR41

All (3)Health meters (2)Toys & light bricks (1)

Used in

Health meters2 devices Toys & light bricks1 device

Compare

SR41 vs LR41Compare

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 LR41?

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.