Description
CJ 18650 Lithium-Ion Battery 3.7V – Rechargeable Cell for DIY & Power Packs
The Chenjiang (CJ) 3.7V 18650 Li-Ion Rechargeable Battery is a reliable cylindrical lithium-ion cell designed for portable electronics, DIY battery packs, robotics, and energy storage applications. Built using NMC lithium-ion chemistry, it provides a good balance of energy density, stability, and cycle life.
Typically available in capacities ranging from 1200mAh to 50000mAh (variant dependent), this battery delivers stable output voltage and consistent performance for everyday electronics. It supports multiple charge-discharge cycles, making it ideal for reusable and long-term applications.
Its standard 18650 form factor (18mm diameter × 65mm length) ensures compatibility with battery holders, DIY packs, and commercial devices.
Key Features
- Rechargeable lithium-ion cell (NMC chemistry)
- Nominal voltage: 3.7V (4.2V fully charged)
- Standard 18650 cylindrical size
- Good energy density and stable output
- Suitable for battery pack assembly
- Multiple capacity options available
Variants – Capacity Options
| Variant | Capacity | Typical Use |
|---|---|---|
| 1200mAh | Low capacity | Toys, small electronics |
| 1800mAh | Medium | DIY projects, backup power |
| 2000mAh | Standard | General-purpose usage |
| 2200–2600mAh | High | Robotics, battery packs |
Specifications (typical)
- Type: Lithium-Ion Rechargeable Cell
- Model: 18650
- Nominal Voltage: 3.7V
- Full Charge Voltage: 4.2V
- Cut-off Voltage: ~2.5V
- Capacity: 1200mAh – 5000mAh
- Chemistry: NMC Li-ion
- Cycle Life: ~300–500 cycles (typical)
- Size: 18mm × 65mm
Applications
- DIY battery packs (2S, 3S, 4S etc.)
- Power banks
- Robotics and IoT devices
- LED lighting systems
- Portable electronics
- Solar energy storage (small scale)
Important Notes
- Use with proper BMS/protection circuit for safety
- Avoid overcharging or deep discharge
- Do not short circuit or puncture
- Charge using a dedicated Li-ion charger (4.2V CC/CV)