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Which cylindrical cells are found in power tool and e-bike batteries – and why the same size does not mean the same cell.
Filter by chemistry, name, manufacturer or format and add individual cells or all matches to the comparison. All cells are drawn to the same scale.
| Cell name | Format | Chemistry | Ø × length | Nominal voltage | Capacity | Energy | Weight | Continuous current (max.) | Data sheet | Remove |
|---|
Drawings without solder tabs or connecting wires. Energy = nominal voltage × capacity, not a measured value. The model examples from manufacturer documentation do not confirm that exactly these models are fitted at Akku New.
With lithium cylindrical cells, the size is in the name: 18650 stands for approx. 18 mm diameter and 65 mm length (the 0 stands for the cylindrical design), 21700 for 21 mm × 70 mm. The designation describes only the design, not the cell chemistry.
Nickel cells have their own names such as Sub-C, AA or 4/3FA. A nickel cell of similar size operates at 1.2 V and is not an interchangeable 18650 cell.
| Format | Chemistry | Ø × length (mm) | Nominal voltage | Capacity (mAh) | Models |
|---|---|---|---|---|---|
| Sub-C / SC | NiCd | 22–22.9 × 41.9–43.5 | 1.2 V | 1,600–2,500 | 6 |
| Sub-C / SC | NiMH | 22–23 × 42.7–43.5 | 1.2 V | 1,300–3,300 | 18 |
| AA | NiMH | 14–14.5 × 48.2–50.5 | 1.2 V | 600–2,200 | 28 |
| 4/3FA | NiMH | 18–18.3 × 67–67.5 | 1.2 V | 2,700–4,500 | 6 |
| C | NiMH | 25–25.8 × 50 | 1.2 V | 3,000–3,500 | 3 |
| D | NiMH | 32.15–33 × 58.2–60.5 | 1.2 V | 6,400–11,000 | 6 |
| 18650 | Lithium-ion | 18.25–18.6 × 64.85–65.4 | 3.6–3.7 V | 2,000–3,500 | 43 |
| 21700 | Lithium-ion | 21.15–21.9 × 70–71 | 3.58–3.7 V | 3,000–5,700 | 26 |
| 26650 | Lithium-ion | 26.5 × 66 | 3.7 V | 5,000 | 1 |
| 18650 | LiFePO₄ | 18.2–18.6 × 64.9–65.5 | 3.2 V | 1,100–2,200 | 6 |
| 26650 | LiFePO₄ | 26.2–26.5 × 65.6–66 | 3.2 V | 3,000–4,500 | 5 |
| 32700 | LiFePO₄ | 31.98 × 70.5 | 3.2 V | 6,000 | 1 |
Compiled from 225 documented manufacturer and retailer specifications, checked on 17 October 2026. Energy and current rating depend on the individual model; the same design can have different electrical values. Do not swap nickel and lithium cells for one another based on their size alone.
A photo of the battery and its rating plate and a short description of the fault are enough for an initial assessment.
