LR41 battery: equivalents & specs
The LR41 is a small 1.5 volt alkaline button cell, 7.9 mm across and 3.6 mm tall, best known as the digital thermometer battery. AG3, LR736 and 192 are the same cell. The silver-oxide SR41, sold as 392 or 384, fits identically and lasts longer.
Same battery, other names
Every code below is the exact same cell as LR41. Any of them will fit and work identically.
Compatible replacements
- SR41 / 392: Silver-oxide same-size replacement (392 high drain, 384 low drain) with steadier voltage and about 45 mAh.
Buying and replacement notes
Most household digital thermometers take one or two LR41 cells, and the cheap multi-packs sold as AG3 work fine for that job. Where the device matters, such as a watch or a medical meter, choose the silver-oxide 392 instead. It has roughly 45 mAh against the alkaline's 30, and its flat 1.55 V discharge keeps readings stable. Old alkaline button cells are also more prone to leaking, which corrodes thermometer contacts.
Commonly used in
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⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.