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395 battery (SR927SW)
SR927SW: 1.55 V silver oxide button cell, 9.5 mm × 2.7 mm, about 55 mAh (85 mWh). Same battery: 395, SR57. Also fits: LR927.
1.55 Vvoltage
9.5 mmdiameter, 0.374 in
2.7 mmthick, 0.106 in
≈ 55 mAhcapacity
SR927SW: what to know
- 395 is the low-drain version and 399 the high-drain one; both are 9.5 mm × 2.7 mm.
SR927SW equivalents
395SR57
- 399: high-drain SR927W
- AG7: alkaline
- LR927: alkaline
Can I use another battery instead of an SR927SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR927 | 9.5 mm × 2.7 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| LR920 | 9.5 mm × 2.05 mm | 1.5 V | Short-term | 0.65 mm thinner: may sit loose; fine short-term. |
| SR920SW | 9.5 mm × 2.05 mm | 1.55 V | Short-term | 0.65 mm thinner: may sit loose; fine short-term. |
| CR927 | 9.5 mm × 2.7 mm | 3 V | No | Wrong voltage: 3 V vs 1.55 V. |
| LR936 | 9.5 mm × 3.6 mm | 1.5 V | No | 0.9 mm thicker: will not fit. |
What uses an SR927SW battery?
- Watches
395 = low drain (analog watches), 399 = high drain (digital, backlights). Same 9.5 mm × 2.7 mm cell; either works in most watches.
Alkaline version: LR927 (AG7), about 40 mAh vs 55 mAh; cheaper but its voltage sags.