---
title: "SR621SW equivalent: 364, 363, SR60"
description: "The SR621SW is a 1.55 V silver oxide cell, also sold as 364, 363, SR60. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/sr621sw/
site: "At One Place"
---

# SR621SW battery

**What replaces a SR621SW: 364, 363, SR60, SR621, SR621W, AG1**

1.55 V silver oxide, 6.8 × 2.1 mm (diameter × height)

The SR621SW is a single-use 1.55 V silver oxide button cell. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** SR621SW
- **ANSI / NEDA:** 1175SO
- **Nominal voltage:** 1.55 V
- **Chemistry:** Silver oxide
- **Size:** 6.8 × 2.1 mm (diameter × height)
- **Typical capacity:** 20 mAh
- **Rechargeable:** No — never charge it

## Codes that mean the same battery

*Different manufacturers, one physical battery. Voltage, chemistry and dimensions all match.*

| Code | Fits? |
| --- | --- |
| 364 | Yes — same cell |
| 363 | Yes — same cell |
| SR60 | Yes — same cell |
| SR621 | Yes — same cell |
| SR621W | Yes — same cell |
| AG1 | Yes — same cell |
| D364 | Yes — same cell |
| V364 | Yes — same cell |
| 1175SO | Yes — same cell |
| GP364 | Yes — same cell |
| SB-AG | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| LR621 / LR60 / 164 | Alkaline, 1.5 V, sloping discharge, well under half the capacity. It fits and it works badly. |
| SR626SW / 377 | Same diameter, half a millimetre taller. It will jam a 364 compartment and can bend the case-back gasket seat. |

> The SR621SW is a primary cell and must never be put in a charger. Charging a sealed primary battery builds gas pressure inside a can with no vent designed for it, which is how they rupture or catch fire. Rechargeable look-alikes exist for several sizes and carry different codes — check the code, not the shape.

## Where it turns up

- Slim ladies' quartz watches
- Thin dress watches from Citizen and Seiko
- Small digital thermometers
- Laser pointers and pen torches

## Common questions

### What is equivalent to a SR621SW?

364, 363, SR60, SR621, SR621W, AG1, D364, V364, 1175SO, GP364, SB-AG — all the same 1.55 V cell under different manufacturer codes.

### Can I use a LR621 / LR60 / 164 instead of a SR621SW?

Alkaline, 1.5 V, sloping discharge, well under half the capacity. It fits and it works badly.

### Is the SR621SW rechargeable?

No. It is a primary cell — charging one risks rupture or fire. Rechargeable look-alikes exist in the same size under different codes.

## Related pages

- [LR44 battery](https://atoneplace.net/battery/lr44/)
- [SR626SW battery](https://atoneplace.net/battery/sr626sw/)
- [SR44 battery](https://atoneplace.net/battery/sr44/)
- [PR41 battery](https://atoneplace.net/battery/za312/)
- [PR48 battery](https://atoneplace.net/battery/za13/)
- [PR44 battery](https://atoneplace.net/battery/za675/)
- [SR920SW battery](https://atoneplace.net/battery/sr920sw/)
- [LR41 battery](https://atoneplace.net/battery/lr41/)
- [PR70 battery](https://atoneplace.net/battery/za10/)
- [SR927SW battery](https://atoneplace.net/battery/sr927sw/)
- [LR1130 battery](https://atoneplace.net/battery/lr1130/)
- [SR1130 battery](https://atoneplace.net/battery/sr1130/)

## Sources

- Official vendor product documentation — At One Place (/about/)