LR41 / AG3
Button Cells · 4 specs
Direct Answer
An LR41 battery (also sold as AG3 or 392) is a 1.5V Alkaline button cell measuring approximately 7.9mm in diameter and 3.6mm in thickness. It's a common size for small thermometers, compact watches, and other low-drain miniature electronics.
Source: IEC 60086-2 · Last reviewed Aug 28, 2026
Specs
| Diameter | 7.90 mm |
| Height | 3.60 mm |
| Nominal Operating Voltage | 1.50 V |
| Chemistry | Alkaline |
Alkaline vs. the Silver Oxide SR41
The LR41 shares its 7.9mm x 3.6mm footprint with the silver-oxide SR41 (also sold as SR736), but the two chemistries behave differently as they discharge: the alkaline LR41 has a gradually sloping voltage curve, while the silver-oxide SR41 holds a steadier voltage for most of its life at a higher cost. For devices like digital thermometers that mainly care about total runtime rather than a perfectly stable voltage, the cheaper alkaline LR41 is usually the more practical choice.