LR626 battery: equivalents & specs
The LR626 is a 1.5 volt alkaline button cell, 6.8 mm across and 2.6 mm tall, also labeled AG4, LR66 or 177. It is the low-cost stand-in for the world's most common watch battery, the silver-oxide SR626SW (377), which shares the exact same dimensions.
Same battery, other names
Every code below is the exact same cell as LR626. Any of them will fit and work identically.
Compatible replacements
- SR626SW / 377: The watch-standard silver-oxide cell in the same size; steadier voltage and roughly double the capacity.
Buying and replacement notes
Cheap fashion watches ship with an AG4 from the factory because it costs a few cents. When it dies, replace it with a 377 (SR626SW) rather than another alkaline: the silver-oxide cell holds 1.55 V until nearly empty, roughly doubles the run time to two or three years, and is far less likely to leak inside the movement. The price difference is under a dollar at most battery counters.
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.