377 Battery Equivalent
377 / SR626SW
The world's most common watch battery
The 377 battery is a 1.55V silver oxide button cell used in most analog quartz watches worldwide. It is also sold as SR626SW — they are exactly the same battery. If your watch has stopped and you need a replacement, this is almost certainly the one you need.
Voltage
1.55V
Chemistry
Silver Oxide
Dimensions
6.8mm diameter × 2.6mm thick
Also known as
SR626SW, SR66, SG4, LR626
Is 377 the same as SR626SW?
Yes — 377 and SR626SW are exactly the same battery. The number 377 is the trade name used by brands like Renata, Energizer, Varta and Sony. SR626SW is the IEC technical standard code for the same cell. You will find both names on packaging and batteries — either is a direct replacement for the other.
All 377 battery equivalents
| Battery code | Type | Compatible? |
|---|---|---|
| SR626SW | Silver oxide | ✓ Direct replacement |
| SR66 | Silver oxide | ✓ Direct replacement |
| SG4 | Silver oxide | ✓ Direct replacement |
| SR626 | Silver oxide | ✓ Direct replacement |
| D377 | Silver oxide | ✓ Direct replacement (Duracell) |
| 377A | Silver oxide | ✓ Direct replacement (Energizer) |
| LR626 | Alkaline | ⚠ Same size but alkaline — use silver oxide for watches |
| AG4 | Alkaline | ⚠ Same size but alkaline — use silver oxide for watches |
| 376 | Silver oxide | ⚠ Same size, lower drain — usable but 377 is preferred |
Always use silver oxide (377 / SR626SW) in watches — not alkaline (LR626 / AG4). Although they are the same physical size, alkaline batteries have a declining voltage curve meaning your watch will run slower as the battery drains. Silver oxide maintains a steady 1.55V until nearly depleted, giving accurate timekeeping and longer battery life.
Buy 377 (SR626SW) batteries on Amazon
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