Cylindrical, Prismatic and Pouch Cells Compared
The cell format decides how a pack fits, cools and is built. Here is how the main formats compare and where each one makes sense.
Four formats, four strengths
Cylindrical
Steel can cells such as 18650 and 21700. Mature, consistent and easy to cool. The most common choice for custom packs.
Cylindrical cells →Prismatic
Large rectangular cells in aluminium cases. Fewer connections for high-capacity LiFePO4 packs.
Cylindrical cell dimensions
The name gives the size: the first two digits are the diameter in mm, the next two the length.
| Cell | Diameter × length | Typical capacity (Li-ion) | Common use |
|---|---|---|---|
| 14500 | 14 × 50 mm | 700–1,000 mAh | Small lights, compact devices |
| 18650 | 18 × 65 mm | 2,000–3,500 mAh | Most custom packs |
| 21700 | 21 × 70 mm | 4,000–5,000 mAh | E-bikes, tools, high-energy packs |
| 26650 | 26 × 65 mm | LiFePO4 3,000–4,000 mAh | LiFePO4 packs, lighting |
| 32140 | 32 × 140 mm | LiFePO4 around 15 Ah | Energy storage, light EVs |
Capacities vary by chemistry and cell model.
When cylindrical wins
- You need proven, consistent cells from major brands
- The pack sees high current and needs good cooling
- Volumes are small to medium
- You want flexible layouts
When prismatic or pouch wins
- Large capacity with fewer connections (prismatic)
- Very thin or unusual shapes (pouch)
- Maximum use of a rectangular space
- Simpler assembly for big LiFePO4 packs
Frequently asked questions
For small and medium packs, cylindrical cells are usually the most cost-effective because they are made in very large volumes. For large LiFePO4 packs, prismatic cells often win.
We can source pouch cells in many standard sizes and arrange custom sizes for larger volumes.
Yes, we build with major brands and qualified domestic cells, and can quote both.
Want help choosing the cell?
Send your space, voltage and current needs. We will suggest the format and cell model that fit.
