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381 battery (SR1120SW)
SR1120SW: 1.55 V silver oxide button cell, 11.6 mm × 2.05 mm, about 45 mAh (70 mWh). Same battery: 381, SR55. Also fits: LR1120.
1.55 Vvoltage
11.6 mmdiameter, 0.46 in
2.05 mmthick, 0.081 in
≈ 45 mAhcapacity
SR1120SW: what to know
- 381 is low drain and 391 high drain; the alkaline twin is the LR1120 (AG8).
SR1120SW equivalents
381SR55
- 391: high-drain SR1120W
- AG8: alkaline
- LR1120: alkaline
Can I use another battery instead of an SR1120SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR1120 | 11.6 mm × 2.05 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| LR1130 | 11.6 mm × 3.05 mm | 1.5 V | No | 1 mm thicker: will not fit. |
| SR1130SW | 11.6 mm × 3.05 mm | 1.55 V | No | 1 mm thicker: will not fit. |
| SR1136SW | 11.6 mm × 3.6 mm | 1.55 V | No | 1.55 mm thicker: will not fit. |
| LR43 | 11.6 mm × 4.2 mm | 1.5 V | No | 2.15 mm thicker: will not fit. |
What uses an SR1120SW battery?
- Watches
- Calculators
381 = low drain (analog watches), 391 = high drain (digital, backlights). Same 11.6 mm × 2.05 mm cell; either works in most watches.
Alkaline version: LR1120 (AG8), about 40 mAh vs 45 mAh; cheaper but its voltage sags.