Home › Button cells › SR721SW
362 battery (SR721SW)
SR721SW: 1.55 V silver oxide button cell, 7.9 mm × 2.1 mm, about 25 mAh (39 mWh). Same battery: 362, SR58. Also fits: LR721.
1.55 Vvoltage
7.9 mmdiameter, 0.311 in
2.1 mmthick, 0.083 in
≈ 25 mAhcapacity
SR721SW: what to know
- 362 is the low-drain cell and 361 the high-drain one; it is 0.5 mm thinner than the 397.
SR721SW equivalents
362SR58
- 361: high-drain SR721W
- AG11: alkaline
- LR721: alkaline
Can I use another battery instead of an SR721SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR721 | 7.9 mm × 2.1 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| SR712SW | 7.9 mm × 1.25 mm | 1.55 V | Short-term | 0.85 mm thinner: may sit loose; fine short-term. |
| SR716SW | 7.9 mm × 1.65 mm | 1.55 V | Short-term | 0.45 mm thinner: may sit loose; fine short-term. |
| LR726 | 7.9 mm × 2.6 mm | 1.5 V | No | 0.5 mm thicker: will not fit. |
| SR726SW | 7.9 mm × 2.6 mm | 1.55 V | No | 0.5 mm thicker: will not fit. |
What uses an SR721SW battery?
- Watches
362 = low drain (analog watches), 361 = high drain (digital, backlights). Same 7.9 mm × 2.1 mm cell; either works in most watches.
Alkaline version: LR721 (AG11), about 20 mAh vs 25 mAh; cheaper but its voltage sags.