21700 vs 20700
Battery Comparison
Home > Battery Comparisons > 21700 vs 20700
| Feature | 21700 | 20700 |
|---|---|---|
| Diameter | 21mm | 20mm |
| Length | 70mm | 70mm |
| Nominal voltage | 3.6-3.7V (Li-ion) | 3.6-3.7V (Li-ion) |
| Typical capacity | 3,000-5,000 mAh | 2,800-4,000 mAh |
| Weight | ~65-70g | ~60-65g |
| Rechargeable | Yes (hundreds of cycles) | Yes (hundreds of cycles) |
| Common chemistries | Li-ion (NMC, NCA), LiFePO4 | Li-ion (NMC, NCA) |
| Device compatibility | Newer EVs (e.g. Tesla Model 3/Y), power tools, high-end flashlights, e-bikes | Some EV packs (e.g. early Tesla Model 3 cells), vape mods, power tools |
| Cost per cell | Moderately higher | Slightly lower |
| Cost per mAh | Often lower (larger capacity per cost) | Comparable, slightly higher per mAh |
| Availability | Increasingly common, growing brand support | Less common, narrower selection than 21700 |
| Interchangeability | Not compatible with 20700 devices/holders; larger diameter | Not compatible with 21700 devices/holders; smaller diameter, though same length |
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