Description
Roofer 18650 3.7V Lithium-Ion Rechargeable Battery (2000mAh / 2200mAh / 2500mAh / 2600mAh)
The Roofer 18650 3.7V Lithium-Ion Rechargeable Battery is a high-performance cylindrical cell designed for DIY battery packs, robotics, IoT devices, and portable electronics. Known for its stable output, good cycle life, and reliable capacity, this battery is widely used in maker and industrial applications.
Available in multiple capacity variants such as 2000mAh, 2200mAh, 2500mAh, and 2600mAh, it provides flexibility depending on your runtime and current requirements. The standard 18650 form factor (18mm × 65mm) ensures compatibility with holders, chargers, and battery pack configurations.
These cells offer high energy density and no memory effect, making them superior to older battery technologies.
Key Features
- Standard 18650 cylindrical cell (18×65mm)
- Nominal voltage: 3.7V (4.2V fully charged)
- Multiple capacity options for flexible usage
- High energy density and lightweight design
- Rechargeable with long cycle life
- Suitable for series/parallel battery pack building
Variants – Capacity Options
| Variant | Capacity | Typical Use |
|---|---|---|
| 2000mAh | Entry-level | Toys, small electronics |
| 2200mAh | Standard | DIY & general use |
| 2500mAh | High capacity | Robotics, IoT devices |
| 2600mAh | Higher backup | Power packs, longer runtime |
Higher capacity variants provide longer backup and better performance in demanding applications.
Specifications (typical)
- Type: Lithium-Ion Rechargeable Cell
- Model: 18650
- Nominal Voltage: 3.7V
- Full Charge Voltage: 4.2V
- Capacity: 2000mAh – 2600mAh
- Discharge Rate: Up to 3C (variant dependent)
- Size: 18mm × 65mm
- Weight: ~45–50g
Applications
- DIY battery packs (2S, 3S, 4S configurations)
- Robotics and automation systems
- Power banks and portable devices
- LED lighting and backup systems
- Solar energy storage (small scale)
Important Safety Notes
- Always use a BMS/protection circuit
- Charge using a proper 4.2V Li-ion charger
- Avoid short circuit, puncture, or overheating
- Do not mix different capacities in one pack