Rechargeable Lithium-ion Battery Nitecore 18650 4000mAh NITNL1840

The Rechargeable Lithium-ion Battery Nitecore 18650 4000mAh NITNL1840 is a high-capacity 18650-format cell designed for devices that accept standard cylindrical lithium-ion batteries. It delivers a nominal capacity of 4000mAh and is intended to extend runtime in compatible equipment such as flashlights, portable lamps, vaporizers and power banks while fitting common 18650 battery holders and chargers.

Advantages

This 18650 cell provides a balance of high capacity and standard dimensions, enabling longer operating times without changing device housings or adapters. The lithium-ion chemistry offers relatively low self-discharge and consistent power output during discharge. The cell is rechargeable, allowing repeated use and reducing the need for disposable batteries. Its compatibility with common 18650 chargers and devices simplifies replacement and maintenance.

Suitable for

• Handheld flashlights and tactical lamps
• Portable lamps and work lights
• Personal vaporizers and similar devices that accept 18650 cells
• Power banks and DIY battery packs using 18650-format cells

Key specifications

• Cell format: 18650 cylindrical lithium-ion
• Nominal capacity: 4000 mAh
• Chemistry: lithium-ion
• Rechargeable: yes
• Typical nominal voltage: 3.6–3.7 V
• Standard cylindrical dimensions: approx. 18 mm diameter × 65 mm length

How to use

Insert the cell into devices that accept 18650-format batteries, observing correct polarity markings and the device manufacturer's instructions. Charge the battery using a charger designed for 18650 lithium-ion cells and follow the charger's recommended current and charging procedure. Do not attempt to force the cell into incompatible holders or to modify the cell to fit device contacts. Replace batteries in pairs or matched sets when used in multi-cell battery packs to maintain balanced performance.

Usage recommendations

Use a dedicated 18650 lithium-ion charger with appropriate protection features such as overcharge and reverse polarity protection. Store batteries in a cool, dry place and avoid exposure to heat or direct sunlight. Inspect cells for damage or swelling before each use; discontinue use and recycle if the cell shows signs of deformation, leakage, or other damage.