# 18650 lithium cell

> What are the exact dimensions of an 18650 cell for a holder?

- Category: Power & cooling › Batteries
- Kind: Standard part
- Basis: industry standard (IEC 60086 naming); nominal values
- Page: https://xemstudio.com/objects/18650-cell/ · JSON: https://xemstudio.com/api/geometry?object=18650-cell · Plain text: https://xemstudio.com/objects/18650-cell/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Overall (mm)

| length | width | height |
|---|---|---|
| 65 | 18 | 18 |

## Notes

- Nominal Ø18 × 65 mm; real cells run Ø18.2–18.6 mm and 65.0–65.3 mm, and protected cells up to ~69 mm long. Design holders for Ø18.6 and 65.5 unless you know the cell.
- Button-top adds about 0.5–1 mm; flat-top is the common unprotected form.

## Where the files are

- Wikipedia: [List of battery sizes](https://en.wikipedia.org/wiki/List_of_battery_sizes) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/18650-cell/index.json

- cell-18650: [STEP](https://xemstudio.com/files/hardware/18650-cell/cell-18650.step) · [STL](https://xemstudio.com/files/hardware/18650-cell/cell-18650.stl) — 18650 typical real size Ø18.3 × 65.2

## Questions

**What are the real dimensions of an 18650 cell?**

Nominal Ø18 × 65 mm; real cells Ø18.2–18.6 and 65.0–65.3 mm, protected cells to about 69 mm. Design holders for Ø18.6 × 65.5.

**Button top vs flat top 18650 length?**

Button-top adds about 0.5–1 mm; flat-top is the common unprotected form used in packs.

## Fits with

- [21700 lithium cell](https://xemstudio.com/objects/21700-cell/)
- [AA and AAA cells](https://xemstudio.com/objects/aa-aaa-cells/)
- [Neodymium disc magnets, common sizes](https://xemstudio.com/objects/neodymium-disc-magnets/)