18500 Battery
Also known as: Lithium-ion cylindrical cell
Shorter version of the popular 18650 format, offering a more compact size for applications where space is limited. Popular in tactical flashlights and devices where 18650 is too long but AA batteries lack sufficient voltage or capacity.
Quick Specifications
Voltage
3.7V
Capacity
1000-1800 mAh
Size
⌀18.6 mm
Height
50 mm
Technical Drawing
Dimensions shown in mm. Drawing not to scale.
Chemistry & Performance
| Chemistry | Voltage | Capacity | End Voltage |
|---|---|---|---|
| Lithium Ion | 3.7V | 1000-1800 mAh | V |
Physical Specifications
- Diameter
- 18.6 mm
- Height
- 50 mm
- Weight (typical)
- 35-40 g
Common Uses
- Compact LED flashlights
- Tactical flashlights
- Vape mods (smaller)
- Portable electronics
- Solar garden lights
- Power banks (compact)
- Electronic cigarettes
- LED work lights
Temperature Range
Operating (Discharge)
-20°C to 60°C
Operating (Charge)
0°C to 45°C
Storage
-20°C to 60°C
Data Sources
- Battery University - Lithium Ion Battery Types
Retrieved: 2025-09-01
- 18650 Battery Store 18500 Guide
Retrieved: 2025-09-01