21700 Battery
Also known as: Lithium-ion cylindrical cell
Successor to 18650 format with significantly higher capacity. Name comes from dimensions: 21mm diameter × 70mm height. Maximum commercial capacity as of 2024 is 6000mAh. Preferred format for Tesla and many EV manufacturers.
Quick Specifications
Voltage
3.7V
Capacity
3000-6000 mAh
Size
⌀21 mm
Height
70 mm
Technical Drawing
Dimensions shown in mm. Drawing not to scale.
Chemistry & Performance
| Chemistry | Voltage | Capacity | End Voltage |
|---|---|---|---|
| Lithium Ion | 3.7V | 3000-6000 mAh | V |
Physical Specifications
- Diameter
- 21 mm
- Height
- 70 mm
- Weight (typical)
- 65-75 g
- Weight (samsung_50e)
- 75 g
Common Uses
- Tesla Model 3/Y
- Electric vehicles
- Power tools
- E-bikes
- High-capacity flashlights
- Power banks
- Energy storage systems
- Vape mods
- Laptops (newer models)
Temperature Range
Operating (Discharge)
-20°C to 60°C
Operating (Charge)
0°C to 45°C
Storage
-30°C to 70°C
Data Sources
- 18650 Battery Store 21700 Technical Guide
Retrieved: 2025-01-09