---
title: "4SR44 equivalent: 544, PX28, PX28S"
description: "The 4SR44 is a 6.2 V silver oxide cell, also sold as 544, PX28, PX28S. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/4sr44/
site: "At One Place"
---

# 4SR44 battery

**What replaces a 4SR44: 544, PX28, PX28S, S1325, V34PX, EPX28**

6.2 V silver oxide, 13 × 25.2 mm (diameter × height)

The 4SR44 is a single-use 6.2 V silver oxide cylindrical. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** 4SR44
- **Nominal voltage:** 6.2 V
- **Chemistry:** Silver oxide
- **Size:** 13 × 25.2 mm (diameter × height)
- **Typical capacity:** 170 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? |
| --- | --- |
| 544 | Yes — same cell |
| PX28 | Yes — same cell |
| PX28S | Yes — same cell |
| S1325 | Yes — same cell |
| V34PX | Yes — same cell |
| EPX28 | Yes — same cell |
| 4G13 | Yes — same cell |
| SR44 x4 | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| 4LR44 / A544 | The alkaline version in the same can, at 6.0 V with a sloping discharge. Where a camera meter was calibrated for silver oxide the alkaline shifts exposure as it ages; where a bark collar just needs 6 V, either is fine. |
| 2CR1/3N / PX28L | The lithium version, 6.0 V and flat, with a decade of shelf life. Usually the best choice, but it is a different chemistry from what an old meter was set up against. |

> The 4SR44 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

- Pentax LX, Minolta XD and Canon film camera meters
- Precision instruments needing a stable 6 V
- Medical devices
- Some laboratory equipment

> Four SR44 silver oxide cells stacked in one can, which is why it is 6.2 V rather than 6.0 — 1.55 V per cell, not 1.5.

## Common questions

### What is equivalent to a 4SR44?

544, PX28, PX28S, S1325, V34PX, EPX28, 4G13, SR44 x4 — all the same 6.2 V cell under different manufacturer codes.

### Can I use a 4LR44 / A544 instead of a 4SR44?

The alkaline version in the same can, at 6.0 V with a sloping discharge. Where a camera meter was calibrated for silver oxide the alkaline shifts exposure as it ages; where a bark collar just needs 6 V, either is fine.

### Is the 4SR44 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

- [LR6 battery](https://atoneplace.net/battery/aa/)
- [LR03 battery](https://atoneplace.net/battery/aaa/)
- [ICR18650 battery](https://atoneplace.net/battery/18650/)
- [LR20 battery](https://atoneplace.net/battery/d/)
- [HR6 battery](https://atoneplace.net/battery/nimh-aa/)
- [LR14 battery](https://atoneplace.net/battery/c/)
- [CR17345 battery](https://atoneplace.net/battery/cr123a/)
- [HR03 battery](https://atoneplace.net/battery/nimh-aaa/)
- [8LR932 battery](https://atoneplace.net/battery/a23/)
- [FR6 battery](https://atoneplace.net/battery/fr6/)
- [INR21700 battery](https://atoneplace.net/battery/21700/)
- [4LR44 battery](https://atoneplace.net/battery/4lr44/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)