Description
Hongli 3.7V 18650 Li-Ion Battery – Budget 1C Cell for DIY & General Use
The Hongli 18650 3.7V Lithium-Ion Rechargeable Battery (1C) is a cost-effective and widely used cylindrical cell designed for DIY electronics, battery packs, and general-purpose applications. It provides stable voltage output and reliable basic performance, making it suitable for low to moderate power requirements.
Typically available in capacities such as 1200mAh, 1800mAh, and up to 2200mAh, this battery follows the standard 18650 form factor (18mm × 65mm) and is compatible with most holders, chargers, and pack configurations.
With a 1C discharge rating, it is optimized for longer runtime rather than high current output, making it ideal for LED lighting, IoT devices, and backup systems.
Key Features
- Standard 18650 cylindrical size (18×65mm)
- Nominal voltage: 3.7V (4.2V fully charged)
- 1C discharge rate – stable output for low-power devices
- Cost-effective solution for bulk and DIY usage
- Rechargeable with typical 300–500 cycles
- Suitable for series/parallel battery pack assembly
Typical Variants (Capacity Options)
| Variant | Capacity | Best Use |
|---|---|---|
| 1200mAh | Entry-level | Toys, emergency lights |
| 1800mAh | Standard | DIY electronics |
| 2200mAh | Better backup | IoT & power banks |
Specifications (typical)
- Type: Lithium-Ion Rechargeable Cell
- Model: 18650 (ICR type)
- Nominal Voltage: 3.7V
- Full Charge Voltage: 4.2V
- Capacity: ~1200mAh – 2200mAh
- Discharge Rate: 1C
- Size: ~18mm × 65mm
- Weight: ~45g
Applications
- DIY battery packs (2S, 3S configurations)
- LED lighting and emergency lights
- Power banks and backup systems
- IoT and embedded electronics
- Small portable devices
Important Notes
- Best suited for low-current applications (not for motors/high load)
- Always use with a BMS/protection circuit
- Charge using a 4.2V Li-ion charger (CC/CV method)
- Avoid mixing with higher-grade or high-discharge cells