SR920SW vs SR626SW
371 is SR920SW at 9.5 × 2.1 mm; 377 is SR626SW at 6.8 × 2.6 mm. Both are 1.55V silver oxide watch cells, but their diameter and thickness differ, so they are not interchangeable.
Last verified Aug 25, 2026
Not interchangeable — both diameter and thickness are different.
A SR626SW vs SR920SW swap fails on diameter, thickness, capacity. If the door only closes when you force it, or the device works only while you press the cover, you have the wrong cell — not a weak spring you should ignore.
They share 1.55 V and SilverOxide, which is why SR920SW vs SR626SW looks interchangeable on a store shelf. Highlighted rows are the ones that change the purchase: diameter, thickness, capacity.
Read physical fit before capacity. Extra milliamp-hours only help when the holder is built for that cell. A “better” spec in the wrong tray is a mechanical or voltage mismatch, not an upgrade.
| Spec | SR920SW | SR626SW |
|---|---|---|
| Chemistry | SilverOxide | SilverOxide |
| Nominal voltage | 1.55 V | 1.55 V |
| Diameter | 9.5 mm | 6.8 mm |
| Thickness | 2.1 mm | 2.6 mm |
| Outline | 9.5 × 2.1 mm | 6.8 × 2.6 mm |
| Typical capacity | 35–45 mAh | 25–30 mAh |
| Unused shelf life | ~5 years | ~5 years |
| Category | silver-oxide-button | silver-oxide-button |
| Common aliases | 371, SR69 | 377, 376, SR66, SR628SW |
If you searched SR626SW vs SR920SW, you are on the same comparison with the names reversed. The difference between SR920SW and SR626SW batteries is not the word “vs” — it is the specs that do not match after you ignore the similar photos.
SR920SW is 9.5 mm across; SR626SW is 6.8 mm. That gap is enough for one cell to miss the clip entirely or rattle in the other tray. IEC codes put diameter in the first digits for a reason: you cannot sand a coin cell down to fit.
SR920SW is 2.1 mm thick; SR626SW is 2.6 mm. Holders are built for one stack height. The thinner cell loses spring pressure (“works only when I press the cover”). The thicker cell jams the door or bends the clip.
Typical SR920SW capacity is 35–45 mAh. SR626SW is 25–30 mAh. Runtime only follows that gap inside the correct holder. Extra capacity in the wrong tray does not last longer — it often does not run at all.
371 = SR920SW; 377 = SR626SW
Both are nominally 1.55V silver oxide, but matching voltage does not overcome the size mismatch
SR628SW appears in some retailer lists around 377, but it is not the standard code for 371
Coin and button codes are rulers, not brand slogans. The letters mark chemistry class. The digits encode size. SR920SW measures 9.5 × 2.1 mm; SR626SW measures 6.8 × 2.6 mm. Once you read the code that way, SR626SW vs SR920SW stops looking like a preference and starts looking like a fit check.
Usually no. SR920SW is 9.5 × 2.1 mm at 1.55 V (SilverOxide). SR626SW is 6.8 × 2.6 mm at 1.55 V (SilverOxide). Those are not the same part.
If the spent cell or tray said SR626SW, specify that code. Forcing SR920SW can crack a cover, lose contact, or apply the wrong voltage.
Usually no. Going the other way does not fix a diameter, thickness, or voltage miss. SR626SW in a SR920SW holder has the same problem with the names flipped.
If you arrived from a SR626SW vs SR920SW search, stay on this page. The answer does not change.
Retail packs hide the IEC size behind house codes. SR920SW also appears as 371, SR69. SR626SW also appears as 377, 376, SR66. Those prefixes do not change the outline unless the chemistry letters change (BR, LIR, ML, PR).
You do not need a full datasheet to settle SR920SW vs SR626SW. You need the stamp, the tray, or a cheap pair of calipers. A store bin labeled only “button cell” or “3V lithium” will not do that work for you.
Do not rely on the similar 37x retail numbers. A 377 will sit loosely in a 371-size seat, while the wider 371 will not enter a 377 holder. If a marketplace listing calls SR628SW a 371 equivalent, check the stated dimensions before buying.
Do not stack cells, grind a can, or use foil as a permanent spacer to fake SR626SW with SR920SW. Read the stamp, then the spec table. If the door will not close without force, you have the wrong height or diameter.
No. They share 1.55V silver oxide chemistry but have different dimensions. 371 is SR920SW at 9.5 × 2.1 mm; 377 is SR626SW at 6.8 × 2.6 mm.
No authoritative manufacturer chart reviewed here uses SR628SW as the standard code for 371. Energizer identifies 371 as SR920SW and 377 as SR626SW. Some retailer cross-reference lists place SR628SW in the 377 family, so verify dimensions.
No. The 377 is narrower and thicker, so it does not match the 371 battery seat even though both cells are 1.55V.
Yes. SR920SW vs SR626SW and SR626SW vs SR920SW are the same pair. Fit, voltage, and chemistry do not change when you flip the order.
Use this guide as a starting point, then confirm voltage, chemistry, and physical size with your device manual or the marking on the old cell.
Reviewed by PlainBattery Technical Review Desk on 2026-08-25. Checked: both model identities and dimensions, voltage and chemistry differences, physical fit, interchangeability conclusion and safety warnings.
Revision record: source citations and field-level review scope added September 11, 2026. See our sources and methodology and corrections policy.
