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364 battery (SR621SW)
SR621SW: 1.55 V silver oxide button cell, 6.8 mm × 2.15 mm, about 23 mAh (36 mWh). Same battery: 364, SR60. Also fits: LR621.
1.55 Vvoltage
6.8 mmdiameter, 0.268 in
2.15 mmthick, 0.085 in
≈ 23 mAhcapacity
SR621SW: what to know
- It is 0.45 mm thinner than the 377 (SR626SW); a 377 will not close in a 364 watch, and a 364 sits loose in a 377 watch.
SR621SW equivalents
364SR60
- 363: high-drain SR621W
- AG1: alkaline
- LR621: alkaline
Can I use another battery instead of an SR621SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR621 | 6.8 mm × 2.15 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| SR616SW | 6.8 mm × 1.65 mm | 1.55 V | Short-term | 0.5 mm thinner: may sit loose; fine short-term. |
| LR626 | 6.8 mm × 2.6 mm | 1.5 V | No | 0.45 mm thicker: will not fit. |
| SR626SW | 6.8 mm × 2.6 mm | 1.55 V | No | 0.45 mm thicker: will not fit. |
What uses an SR621SW battery?
- Watches
- Small toys
- Laser pointers
Guides: wrist watch
364 = low drain (analog watches), 363 = high drain (digital, backlights). Same 6.8 mm × 2.15 mm cell; either works in most watches.
Alkaline version: LR621 (AG1), about 13 mAh vs 23 mAh; cheaper but its voltage sags.