Rechargeable Lithium-ion Battery Fenix MR18650 2600mAh 3.7V, single cell

Fenix MR18650 is a single rechargeable lithium-ion cell with a nominal capacity of 2600mAh and a nominal voltage of 3.7V. The cell conforms to the standard 18650 cylindrical format, making it compatible with a wide range of portable devices such as torches, power banks, and other equipment that accept 18650 batteries. Supplied as an individual replacement cell, the MR18650 delivers high energy density suitable for applications requiring sustained runtime and dependable rechargeability.

Advantages

The Fenix MR18650 battery offers a balance of capacity and size, providing extended run times compared with smaller-format rechargeable cells while maintaining the standard 18650 dimensions for broad compatibility. Its lithium-ion chemistry ensures stable nominal voltage and efficient energy storage for repeated charge/discharge cycles. Supplied as a single cell, it is convenient for direct replacement, battery packs, or DIY projects where one high-capacity 18650 cell is required.

Suitable for

• Tactical and handheld torches that accept 18650 cells
• Portable power banks and DIY power packs
• Rechargeable battery holders and multi-cell battery assemblies
• Electronic devices and tools designed around 18650 form factor

Key specifications

• Cell type: Lithium-ion rechargeable cell
• Nominal capacity: 2600 mAh
• Nominal voltage: 3.7 V
• Form factor: 18650 cylindrical cell
• Configuration: Single individual cell for replacement or assembly

How to use

Insert the MR18650 cell into a compatible device observing correct polarity. Charge the cell only with a charger designed for lithium-ion 18650 cells and follow the charger manufacturer’s instructions. Do not attempt to force the cell into devices that require protected or different-sized cells. For assemblies or DIY battery packs, ensure proper insulation, secure connections, and use a suitable battery management system if multiple cells are combined.

Usage recommendations

Charge with a dedicated 18650 lithium-ion charger, avoid deep discharge below the device-recommended cut-off voltage, store in a cool, dry place at partial charge for long-term storage, and replace the cell if it shows signs of damage, swelling, or significant capacity loss.