---
title: "LR9 equivalent: PX625A, V625U, 625A"
description: "The LR9 is a 1.5 V alkaline cell, also sold as PX625A, V625U, 625A. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/lr9/
site: "At One Place"
---

# LR9 battery

**What replaces a LR9: PX625A, V625U, 625A, EPX625G, D625, MR09**

1.5 V alkaline, 15.6 × 6.2 mm (diameter × height)

The LR9 is a single-use 1.5 V alkaline button cell. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** LR9
- **Nominal voltage:** 1.5 V
- **Chemistry:** Alkaline
- **Size:** 15.6 × 6.2 mm (diameter × height)
- **Typical capacity:** 190 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? |
| --- | --- |
| PX625A | Yes — same cell |
| V625U | Yes — same cell |
| 625A | Yes — same cell |
| EPX625G | Yes — same cell |
| D625 | Yes — same cell |
| MR09 | Yes — same cell |
| KA625 | Yes — same cell |
| A625PX | Yes — same cell |
| LR09 | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| PX625 mercury | The cell this replaces mechanically but not electrically. The original was 1.35 V and flat; this is 1.5 V falling steadily. In a torch or a calculator that is irrelevant. In a light meter it means every reading is wrong, by an amount that changes as the battery ages. |

> The LR9 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 where absolute accuracy is not needed
- Older calculators
- Car key torch bulbs
- Small instruments built for the PX625 shell

> Capacity varies between roughly 170 and 200 mAh by brand. Sold as a PX625 replacement, which it is dimensionally and is not electrically — see the PX625 entry for what to use instead in a meter.

## Common questions

### What is equivalent to a LR9?

PX625A, V625U, 625A, EPX625G, D625, MR09, KA625, A625PX, LR09 — all the same 1.5 V cell under different manufacturer codes.

### Can I use a PX625 mercury instead of a LR9?

The cell this replaces mechanically but not electrically. The original was 1.35 V and flat; this is 1.5 V falling steadily. In a torch or a calculator that is irrelevant. In a light meter it means every reading is wrong, by an amount that changes as the battery ages.

### Is the LR9 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

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