Silver Oxide Button Cells (1.55V) reference
SR920SW
371 silver oxide watch cell — 9.5 × 2.1 mm. It is wider and thinner than 377/SR626SW.
SR920SW aliases and equivalent names
Common search labels and closely related markings include 371, SR69. Packaging conventions vary, so confirm the compatibility grade, voltage, chemistry, and dimensions shown below before replacing the battery.
Voltage
1.55 V
Chemistry
SilverOxide
Capacity
35–45 mAh
Size
9.5×2.1 mm
SR920SW9.5 × 2.1 mm
Exact equivalents
Exact- 371 — Common low-drain US watch battery label
- SR69 — Alternate IEC family designation
- 370 — SR920W high-drain counterpart — same dimensions
- SR920W — High-drain version in the same 9.5 × 2.1 mm size
Do not use
Not Compatible- SR626SW — SR626SW/377 is 6.8 × 2.6 mm — narrower and thicker than SR920SW/371
Technical data
Specifications
| Specification | Value |
|---|---|
| IEC / Common Code | SR920SW |
| Chemistry | SilverOxide |
| Nominal Voltage | 1.55 V |
| Capacity | 35–45 mAh |
| Cutoff Voltage | ~1.2 V |
| Drain Class | low |
| Dimensions (D × H) | 9.5 × 2.1 mm |
| Shelf Life | ~5 years (unused, room temp) |
Typical applications
- Wrist watches
- Analog quartz movements
- Watchmaker replacements
Applications
Replacement Compatibility
SR626SW/377 is 6.8 × 2.6 mm — narrower and thicker than SR920SW/371
Side-by-side comparisons
Frequently Asked Questions
Is 371 the same as SR920SW?
Yes. 371 is the common retail number for the 9.5 × 2.1 mm SR920SW silver oxide watch cell.
Can a 377 replace a 371?
No. A 377/SR626SW is 6.8 × 2.6 mm, while a 371/SR920SW is 9.5 × 2.1 mm.
Should I always trust cross-reference charts?
Use this guide as a starting point, then confirm with your device manual. Chemistry and voltage must match for safe operation.
Related Batteries
Review record and primary sources
Reviewed by PlainBattery Technical Review Desk on 2026-08-25. Checked: model and alias mapping, nominal voltage and chemistry, physical dimensions, capacity range and replacement warnings.
- Silver Oxide (SR) and Alkaline Button (LR) Battery Specifications — Maxell. SR/LR model dimensions, voltage, nominal capacity and drain class.
Revision record: source citations and field-level review scope added September 11, 2026. See our sources and methodology and corrections policy.
Selection notes
Match 371 with SR920SW and 377 with SR626SW. The numbers look similar, but both diameter and thickness differ.
Last verified Aug 25, 2026. Always confirm voltage, chemistry, and dimensions with the device manufacturer before replacing any battery.