---
title: "SR43 equivalent: 386, 301, SR1142"
description: "The SR43 is a 1.55 V silver oxide cell, also sold as 386, 301, SR1142. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/sr43/
site: "At One Place"
---

# SR43 battery

**What replaces a SR43: 386, 301, SR1142, SR43W, SR43SW, D386**

1.55 V silver oxide, 11.6 × 4.2 mm (diameter × height)

The SR43 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:** SR43
- **ANSI / NEDA:** 1133SO
- **Nominal voltage:** 1.55 V
- **Chemistry:** Silver oxide
- **Size:** 11.6 × 4.2 mm (diameter × height)
- **Typical capacity:** 120 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? |
| --- | --- |
| 386 | Yes — same cell |
| 301 | Yes — same cell |
| SR1142 | Yes — same cell |
| SR43W | Yes — same cell |
| SR43SW | Yes — same cell |
| D386 | Yes — same cell |
| V386 | Yes — same cell |
| 1133SO | Yes — same cell |
| SB-A8 | Yes — same cell |
| MS76H | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| LR43 / 186 / AG12 | Alkaline in the same can: 1.5 V, sloping, 123 mAh. Same physical fit, different voltage behaviour. |
| SR44 / 357 | Same diameter, 1.2 mm taller. It will not close an SR43 compartment. |

> The SR43 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

- Vintage camera meters via an MR-9 voltage adapter
- Older quartz watches
- Medical and dental instruments
- Small electronic test gear

> The cell that goes inside an MR-9 adapter to replace a PX625 mercury cell: the adapter drops its 1.55 V to the 1.35 V a vintage light meter expects.

## Common questions

### What is equivalent to a SR43?

386, 301, SR1142, SR43W, SR43SW, D386, V386, 1133SO, SB-A8, MS76H — all the same 1.55 V cell under different manufacturer codes.

### Can I use a LR43 / 186 / AG12 instead of a SR43?

Alkaline in the same can: 1.5 V, sloping, 123 mAh. Same physical fit, different voltage behaviour.

### Is the SR43 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/)
- [SR621SW battery](https://atoneplace.net/battery/sr621sw/)
- [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/)

## Sources

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