Nitecore NL1840R 4000mAh Rechargeable 18650 USB-C Battery - High Performance

The Nitecore NL1840R battery offers a capacity of 4000mAh at 3.6V (14.4Wh), collaboratively developed by Nitecore and its industry partner for an energy density of 288mWh/g, 17.6% higher than conventional 18650 batteries. Equivalent to 4 CR123A batteries, it integrates a direct USB-C charging port, eliminating the need for an external charger for maximum runtime with ultimate simplicity.

Integrated USB-C Charging and Performance

Unlike traditional 18650 batteries, the NL1840R recharges directly via its integrated USB-C port (input 5V⎓1.5A), no external charger required. An LED indicator confirms status: red constant-on while charging, green constant-on once fully charged. It also remains compatible with external Nitecore chargers (UMS4, UMS2, Ci4, Ci2) for dual charging flexibility. With over 500 full charging cycles, it still retains over 80% of its original capacity, ensuring a durable and cost-effective investment.

Maximum Internal and External Safety

The NL1840R incorporates a dedicated intelligent protection circuit on the positive polarity, using a high-quality battery protection chip and high-power MOS-FET for optimal efficiency and output, effectively protecting against overcharge, over-discharge and short-circuiting. A pressure relief valve activates in the event of a rapid temperature increase. Externally, nickel-plated stainless steel protectors at both ends ensure impact and oxidation resistance, coated with a durable metallic film against abrasion. Its mercury-free, lead-free, cadmium-free construction ensures safe use and storage. CE and RoHS certified for guaranteed international reliability.

Specifications

• Li-ion 18650 rechargeable protected battery
• Nominal capacity: 4000mAh at 3.6V (14.4Wh)
• Energy density: 288mWh/g
• Charging port: Integrated USB-C (input 5V⎓1.5A)
• Charging indicator: LED red (charging) / green (complete)
• Recharge cycles: Over 500 full cycles (>80% capacity retained)
• Built-in protection: Overcharge, deep discharge, short circuit
• Pressure relief valve built-in
• Nickel-plated stainless steel protectors (both ends)
• Mercury free, lead free, cadmium free
• Certifications: CE, RoHS
• Dimensions: 2.80" / 71.0mm±0.3mm (L) x 0.73" / 18.5mm±0.3mm (diameter)
• Weight: 1.80oz / 51g
• Compatible chargers: Integrated USB-C cable or external chargers UMS4, UMS2, Ci4, Ci2

Box Contents

• 1 NL1840R 4000mAh 18650 USB-C Battery

Compatibility

Compatible with most 18650-based flashlights and lighting devices available on the market.

FAQ - Frequently Asked Questions

What is the lifespan of the NL1840R battery?

The battery can perform over 500 full recharge cycles while retaining over 80% of its original capacity.

How do I charge this battery?

Connect a USB-C cable directly to the battery's integrated port, no external charger needed. It also remains compatible with Nitecore UMS4, UMS2, Ci4 and Ci2 chargers.

What is the difference with a standard 18650 battery?

The NL1840R integrates a USB-C charging port directly on the battery for simple charging without an external charger, while also offering 17.6% higher capacity than conventional 18650 batteries.

What is the warranty on this battery?

The NL1840R battery comes with a 12-month warranty from the date of purchase.