LR1120 battery: equivalents & specs
The LR1120 is a slim 1.5 volt alkaline button cell, 11.6 mm across but only 2.1 mm tall, also known as AG8, LR55 or 191. Its silver-oxide siblings are the 391 (SR1120W) and 381 (SR1120SW), which fit the same compartment and suit watches far better.
Same battery, other names
Every code below is the exact same cell as LR1120. Any of them will fit and work identically.
Compatible replacements
- SR1120 / 391: Silver-oxide equivalent (391 high drain, 381 low drain) in the same slim 11.6 mm case.
Buying and replacement notes
Wide and thin, this size serves slim watch movements and flat gadgets. It shares its 11.6 mm diameter with the LR1130, LR43 and LR44, so height is the only thing separating four different batteries; measure the old cell rather than guessing. For watches, the 381 handles simple analog movements and the 391 covers models with backlights or alarms.
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.