# 21700 lithium cell

> What are the dimensions of a 21700 cell?

- Category: Power & cooling › Batteries
- Kind: Standard part
- Basis: industry standard; nominal values
- Page: https://xemstudio.com/objects/21700-cell/ · JSON: https://xemstudio.com/api/geometry?object=21700-cell · Plain text: https://xemstudio.com/objects/21700-cell/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Overall (mm)

| length | width | height |
|---|---|---|
| 70 | 21 | 21 |

## Notes

- Nominal Ø21 × 70 mm; real cells about Ø21.1–21.4 and 70.0–70.5 mm.
- Not interchangeable with 18650 holders.

## 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/21700-cell/index.json

- cell-21700: [STEP](https://xemstudio.com/files/hardware/21700-cell/cell-21700.step) · [STL](https://xemstudio.com/files/hardware/21700-cell/cell-21700.stl) — 21700 typical real size Ø21.2 × 70.2

## Questions

**Are 21700 and 18650 holders interchangeable?**

No: 21700 is Ø21.1–21.4 × 70.0–70.5 mm versus Ø18.5 × 65 for 18650.

**What are 21700 cell dimensions?**

Nominal Ø21 × 70 mm; design holders for Ø21.5 × 70.6.

## Fits with

- [18650 lithium cell](https://xemstudio.com/objects/18650-cell/)
- [AA and AAA cells](https://xemstudio.com/objects/aa-aaa-cells/)