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397 battery (SR726SW)
SR726SW: 1.55 V silver oxide button cell, 7.9 mm × 2.6 mm, about 32 mAh (50 mWh). Same battery: 397, SR59. Also fits: LR726.
1.55 Vvoltage
7.9 mmdiameter, 0.311 in
2.6 mmthick, 0.102 in
≈ 32 mAhcapacity
SR726SW: what to know
- 397 is low drain and 396 high drain; at 2.6 mm it sits between the 362 (2.1 mm) and the 329 (3.1 mm).
SR726SW equivalents
397SR59
- 396: high-drain SR726W
- AG2: alkaline
- LR726: alkaline
Can I use another battery instead of an SR726SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR726 | 7.9 mm × 2.6 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| SR716SW | 7.9 mm × 1.65 mm | 1.55 V | Short-term | 0.95 mm thinner: may sit loose; fine short-term. |
| LR721 | 7.9 mm × 2.1 mm | 1.5 V | Short-term | 0.5 mm thinner: may sit loose; fine short-term. |
| SR721SW | 7.9 mm × 2.1 mm | 1.55 V | Short-term | 0.5 mm thinner: may sit loose; fine short-term. |
| SR731SW | 7.9 mm × 3.1 mm | 1.55 V | No | 0.5 mm thicker: will not fit. |
What uses an SR726SW battery?
- Watches
- Small calculators
397 = low drain (analog watches), 396 = high drain (digital, backlights). Same 7.9 mm × 2.6 mm cell; either works in most watches.
Alkaline version: LR726 (AG2), about 20 mAh vs 32 mAh; cheaper but its voltage sags.