---
title: "ICR18650 equivalent: INR18650, IMR18650, NCR18650"
description: "The ICR18650 is a 3.6 V lithium-ion (rechargeable) cell, also sold as INR18650, IMR18650, NCR18650. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/18650/
site: "At One Place"
---

# ICR18650 battery

**What replaces a ICR18650: INR18650, IMR18650, NCR18650, 1865, 18650 Li-ion**

3.6 V lithium-ion (rechargeable), 18 × 65 mm (diameter × height)

The ICR18650 is a rechargeable 3.6 V lithium-ion (rechargeable) cylindrical. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** ICR18650
- **Nominal voltage:** 3.6 V
- **Chemistry:** Lithium-ion (rechargeable)
- **Size:** 18 × 65 mm (diameter × height)
- **Typical capacity:** 3000 mAh
- **Rechargeable:** Yes

## Codes that mean the same battery

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

| Code | Fits? |
| --- | --- |
| INR18650 | Yes — same cell |
| IMR18650 | Yes — same cell |
| NCR18650 | Yes — same cell |
| 1865 | Yes — same cell |
| 18650 Li-ion | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| Protected 18650 | A protection board on the negative end adds 2–5 mm, making the cell 67–70 mm long. Torches and packs built for unprotected cells will not close on one, and battery-bay springs built for protected cells may not reach an unprotected one. |
| Button-top vs flat-top | A flat-top cell will not make contact in a series holder designed for button tops. Same cell electrically, and a very common reason a new battery appears dead. |
| Two CR123A | Two 3 V primaries stack to roughly the same length and 6 V. Some torches accept either and say so on the body; assuming without checking has destroyed a lot of drivers. |

## Where it turns up

- Laptop battery packs and power banks
- High-output torches and headlamps
- Cordless power tools
- Tesla Model S and early EV packs

> Capacity runs 2000–3600 mAh for genuine cells; anything claiming 6000 mAh or more on a wrapper is a relabelled cell and usually holds under 1000. Nominal 3.6–3.7 V depending on cathode, 4.2 V fully charged, and 2.5–3.0 V is the floor below which the cell is damaged.

## Common questions

### What is equivalent to a ICR18650?

INR18650, IMR18650, NCR18650, 1865, 18650 Li-ion — all the same 3.6 V cell under different manufacturer codes.

### Can I use a Protected 18650 instead of a ICR18650?

A protection board on the negative end adds 2–5 mm, making the cell 67–70 mm long. Torches and packs built for unprotected cells will not close on one, and battery-bay springs built for protected cells may not reach an unprotected one.

### Is the ICR18650 rechargeable?

Yes. Use a charger made for its chemistry and never substitute a primary cell of the same size.

## Related pages

- [LR6 battery](https://atoneplace.net/battery/aa/)
- [LR03 battery](https://atoneplace.net/battery/aaa/)
- [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/)