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SR626SW vs SR621SW
SR626SW and SR621SW are only partly interchangeable. They differ in thickness (2.6 mm vs 2.15 mm). The SR626SW holds about 1.2× the energy of the SR621SW (28 mAh vs 23 mAh).
| SR626SW | SR621SW | |
|---|---|---|
| Type | silver oxide button cell | silver oxide button cell |
| Voltage | 1.55 V | 1.55 V |
| Size | 6.8 mm × 2.6 mm | 6.8 mm × 2.15 mm |
| Typical capacity | ≈ 28 mAh | ≈ 23 mAh |
| Rechargeable | no | no |
| Other codes | 377, 376, AG4, LR626 | 364, 363, AG1, LR621 |
Can I use SR621SW instead of SR626SW?
Short-term. 0.45 mm thinner: may sit loose; fine short-term.
Can I use SR626SW instead of SR621SW?
No. 0.45 mm thicker: will not fit.
Where each one is used
SR626SW: analog wrist watches (the most common watch battery); small toys and games; laser pointers.
SR621SW: watches; small toys; laser pointers.
Both sizes turn up in wrist watches, depending on the model, which is why people mix them up: check the code on the old cell.