SR626SW Battery Equivalent
SR626SW / 377
The world's most common watch battery
SR626SW and 377 are the same battery. It powers most analog quartz watches from Seiko, Citizen, Timex, Sekonda, Rotary, Accurist and many more. Silver oxide chemistry gives it a flat discharge curve and longer life than alkaline equivalents.
Voltage
1.55V
Chemistry
Silver Oxide
Dimensions
6.8mm diameter × 2.6mm thick
Typical battery life
2–3 years in a watch
Is SR626SW the same as 377?
Yes — SR626SW and 377 are exactly the same battery. SR626SW is the IEC technical standard code. 377 is the common trade name used by Renata, Energizer, Varta, Sony and others. You will find them sold under both names — either works perfectly.
All SR626SW / 377 equivalents
| Battery code | Type | Compatible? |
|---|---|---|
| 377 | Silver oxide | ✓ Direct replacement |
| 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, slightly lower drain — usable but 377 is preferred |
| SR626W | Silver oxide | ⚠ Same size, lower drain variant — works but SW is correct for most watches |
Silver oxide vs alkaline — does it matter?
Always use silver oxide (SR626SW / 377) in watches — not alkaline (LR626 / AG4). Although they are the same physical size, alkaline batteries have a declining voltage curve — your watch will run slower and slower as the battery drains. Silver oxide maintains a steady 1.55V until nearly depleted, giving accurate timekeeping and longer life. The price difference is minimal.
Watches that use SR626SW / 377
Seiko SUR311, SUR312, SUR209 and most analog quartz Seiko watches
Citizen Most non-solar Citizen analog quartz watches
Timex Weekender, Easy Reader, Expedition and most Timex analog watches
Sekonda Most Sekonda analog quartz watches
Rotary Most Rotary analog quartz watches
Accurist Most Accurist analog quartz watches
Skagen Many slim Skagen analog watches
Fossil Most Fossil analog 3-hand watches
Hugo Boss Most Hugo Boss analog quartz watches
Armani Exchange Most AX analog quartz watches
Always check the battery inside your watch for the exact code — some models use SR920SW (371) or other sizes.
How to check your watch battery code
The safest way is to open the caseback and look at the existing battery — the code is printed on the top. If your watch is still running, a jeweller can usually confirm the battery size without replacing it.
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