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377 battery (SR626SW)
SR626SW: 1.55 V silver oxide button cell, 6.8 mm × 2.6 mm, about 28 mAh (43 mWh). Same battery: 377, SR66. Also fits: LR626.
1.55 Vvoltage
6.8 mmdiameter, 0.268 in
2.6 mmthick, 0.102 in
≈ 28 mAhcapacity
SR626SW: what to know
- Renata 377, Energizer 377 / 376, Maxell and Sony SR626SW and Seiko SB-AW are the same cell.
- It is 0.45 mm thicker than the 364 (SR621SW), so the two are not interchangeable even though they look alike.
SR626SW equivalents
377SR66
- 376: high-drain SR626W
- AG4: alkaline
- LR626: alkaline
- 177: alkaline
Can I use another battery instead of an SR626SW?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR626 | 6.8 mm × 2.6 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 | 0.95 mm thinner: may sit loose; fine short-term. |
| LR621 | 6.8 mm × 2.15 mm | 1.5 V | Short-term | 0.45 mm thinner: may sit loose; fine short-term. |
| SR621SW | 6.8 mm × 2.15 mm | 1.55 V | Short-term | 0.45 mm thinner: may sit loose; fine short-term. |
What uses an SR626SW battery?
- Analog wrist watches (the most common watch battery)
- Small toys and games
- Laser pointers
Guides: wrist watch
377 = low drain (analog watches), 376 = high drain (digital, backlights). Same 6.8 mm × 2.6 mm cell; either works in most watches.
Alkaline version: LR626 (AG4), about 20 mAh vs 28 mAh; cheaper but its voltage sags.