---
title: "LR03 equivalent: LR03, 24A, MN2400"
description: "The LR03 is a 1.5 V alkaline cell, also sold as LR03, 24A, MN2400. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/aaa/
site: "At One Place"
---

# LR03 battery

**What replaces a LR03: LR03, 24A, MN2400, E92, AM4, Micro**

1.5 V alkaline, 10.5 × 44.5 mm (diameter × height)

The LR03 is a single-use 1.5 V alkaline cylindrical. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** LR03
- **ANSI / NEDA:** 24A
- **Nominal voltage:** 1.5 V
- **Chemistry:** Alkaline
- **Size:** 10.5 × 44.5 mm (diameter × height)
- **Typical capacity:** 1150 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? |
| --- | --- |
| LR03 | Yes — same cell |
| 24A | Yes — same cell |
| MN2400 | Yes — same cell |
| E92 | Yes — same cell |
| AM4 | Yes — same cell |
| Micro | Yes — same cell |
| UM-4 | Yes — same cell |
| Type 24 | Yes — same cell |
| R03 (zinc-carbon size) | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| 10440 | A lithium-ion cell in the AAA shape at 3.7 V. More than twice the voltage; it will destroy the device. |
| NiMH AAA / HR03 | Rechargeable at 1.2 V, around 800–1000 mAh. Fine in most things, early "low battery" warnings in some. |

> The LR03 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

- Remote controls and small torches
- Wireless mice and computer peripherals
- Digital thermometers and blood pressure monitors
- Electric toothbrush timers and small toys

> Typically 1000–1200 mAh at a low drain and well under that in anything demanding, on the same measurement caveat as AA.

## Common questions

### What is equivalent to a LR03?

LR03, 24A, MN2400, E92, AM4, Micro, UM-4, Type 24, R03 (zinc-carbon size) — all the same 1.5 V cell under different manufacturer codes.

### Can I use a 10440 instead of a LR03?

A lithium-ion cell in the AAA shape at 3.7 V. More than twice the voltage; it will destroy the device.

### Is the LR03 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/)
- [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/)
- [CR15H270 battery](https://atoneplace.net/battery/cr2/)

## Sources

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