# Lithium cells: 14500, 16340, 18350, 26650, 32650

> What are 26650 and 14500 battery dimensions?

- Category: Power & cooling › Batteries
- Kind: Hardware
- Basis: IEC 61960 naming (first two digits diameter, next two length in mm, trailing 0 = cylindrical); real cells run slightly over nominal
- Page: https://xemstudio.com/objects/lithium-cells-14500-to-32650/ · JSON: https://xemstudio.com/api/geometry?object=lithium-cells-14500-to-32650 · Plain text: https://xemstudio.com/objects/lithium-cells-14500-to-32650/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Nominal: 14500 Ø14 × 50 (AA-sized, 3.7 V, not interchangeable with AA), 16340 Ø16 × 34 (CR123A size), 18350 Ø18 × 35, 26650 Ø26 × 65, 32650 Ø32 × 65.
- Real cells and wraps add 0.2–0.5 mm to diameter and 0.3 mm to length; protected cells add 2–4 mm length. Design holders at nominal + 0.5 diameter, + 1.5 length.
- See the 18650 and 21700 entries for the two common pack cells.

## Sizes

| cell | dia_mm | length_mm | design_holder_mm | note |
|---|---|---|---|---|
| 14500 | 14 | 50 | Ø14.5 × 51.5 | AA size, 3.7 V |
| 16340 | 16 | 34 | Ø16.5 × 35.5 | CR123A size |
| 18350 | 18 | 35 | Ø18.5 × 36.5 | short 18650 |
| 18650 | 18 | 65 | Ø18.6 × 65.5 | see entry |
| 21700 | 21 | 70 | Ø21.5 × 70.6 | see entry |
| 26650 | 26 | 65 | Ø26.5 × 66.5 | high capacity |
| 32650 | 32 | 65 | Ø32.5 × 66.5 | LiFePO4 common |

## 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)
- Wikipedia: [Lithium-ion battery](https://en.wikipedia.org/wiki/Lithium-ion_battery) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/index.json

- cell-14500: [STEP](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-14500.step) · [STL](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-14500.stl) — 14500 nominal Ø14.0 × 50.0
- cell-16340: [STEP](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-16340.step) · [STL](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-16340.stl) — 16340 nominal Ø16.0 × 34.0
- cell-18350: [STEP](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-18350.step) · [STL](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-18350.stl) — 18350 nominal Ø18.0 × 35.0
- cell-26650: [STEP](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-26650.step) · [STL](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-26650.stl) — 26650 nominal Ø26.0 × 65.0
- cell-32650: [STEP](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-32650.step) · [STL](https://xemstudio.com/files/hardware/lithium-cells-14500-to-32650/cell-32650.stl) — 32650 nominal Ø32.0 × 65.0

## Questions

**What are 26650 battery dimensions?**

Nominal Ø26 × 65 mm; real cells about Ø26.3 × 65.5. Design holders Ø26.5 × 66.5.

**Is a 14500 the same size as AA?**

Same nominal Ø14 × 50 mm, but 3.7 V instead of 1.5 V; it fits AA holders and will damage AA-only devices.

**What are 16340 battery dimensions?**

Ø16 × 34 mm, the rechargeable CR123A size; protected versions reach 36 mm.

## Fits with

- [18650 lithium cell](https://xemstudio.com/objects/18650-cell/)
- [21700 lithium cell](https://xemstudio.com/objects/21700-cell/)
- [AA and AAA cells](https://xemstudio.com/objects/aa-aaa-cells/)
- [CR2032 coin cell](https://xemstudio.com/objects/cr2032-coin-cell/)