371 Battery Equivalent
The 371 battery (SR920SW) is a 1.55V silver oxide button cell, 9.5mm in diameter and 2.1mm thick. Direct equivalents include SR920SW, SR69, D371 and V371. Always use silver oxide, not alkaline (LR920 / AG6), in watches for accurate timekeeping.
Common watch battery for larger movements
The 371 battery is a 1.55V silver oxide button cell used in many Seiko, Citizen, Rotary and chronograph watches. It is also sold as SR920SW — they are exactly the same battery. Larger than the more common 377 (SR626SW), the 371 is typically found in watches with more complex or larger movements.
Is 371 the same as SR920SW?
What is the difference between 371 and 377?
371 and 377 are different sizes — they are not interchangeable. The 371 (SR920SW) is 9.5mm in diameter. The 377 (SR626SW) is smaller at 6.8mm in diameter. The 377 is the more common battery for standard analog quartz watches. Always check the battery inside your watch for the exact code before purchasing.
All 371 battery equivalents
| Battery code | Type | Compatible? |
|---|---|---|
| SR920SW | Silver oxide | ✓ Direct replacement |
| SR69 | Silver oxide | ✓ Direct replacement |
| SR920 | Silver oxide | ✓ Direct replacement |
| D371 | Silver oxide | ✓ Direct replacement (Duracell) |
| 371A | Silver oxide | ✓ Direct replacement (Energizer) |
| V371 | Silver oxide | ✓ Direct replacement (Varta) |
| LR920 | Alkaline | ⚠ Same size but alkaline — use silver oxide for watches |
| AG6 | Alkaline | ⚠ Same size but alkaline — use silver oxide for watches |
| 370 | Silver oxide | ⚠ Same size, lower drain — usable but 371 is preferred |
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