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- 4000mAh and 3.6V 18650 battery delivers reliable power to flashlights
- Internal protections maintain peak performance during everyday use
- Environmentally friendly design with reusable lithium-ion chemistry and mercury, lead, cadmium free design
- 500 charge cycles for long-term rechargeable use
- Size: 18650
- Voltage: 3.6
- Rechargeable: Yes
- Chemistry: Li-Ion
- Capacity (mAh): 4000
- Terminal Type: Button Top
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Description
Nitecore NL1840 Li-Ion Battery
High-Performance Battery
If you want power that ensures your flashlight will always perform at its peak, use the Nitecore NL1840! Its 4000mAh capacity and 3.6V voltage make it an excellent 18650 battery for powering your favorite flashlights. Its rechargeable lithium-ion chemistry gives it a lifespan of 500 charge cycles for years of use.
Safety Features
This 18650 battery is designed without the use of mercury, lead, and cadmium, making it an environmentally and user-safe power supply so you can use your flashlights worry free. With internal protections against short-circuiting, overcharge, and overdischarge, this battery maintains safe, peak performance even after hours of use in all your favorite gear. Its nickel-plated stainless steel protectors, combined with a metallic film, also protect it against oxidation, scrapes, and impacts so your flashlight can keep going even if you drop it in tough conditions.
- Notable Features
- » IPX6 water resistance for safe use in rainy conditions
- » Rechargeable, cadmium free, lead free, and mercury free design make it environmentally friendly
- » Designed with internal and external features to preserve battery health
- » Compatible with Nitecore UMS4, UMS2, Ci4, and Ci2 chargers
Item Details
| Brand | Nitecore |
| SKU | NITECORE-NL1840 |
| Series | NL |
| MPN | NL1840 |
| UPC | 6952506496396 |
| Size | 18650 |
| Voltage | 3.6 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 4000 |
| Chemistry | Li-Ion |
| Packaging | Boxed |
| QTY Per Package | 1 |
| California Residents | see Prop 65 WARNINGS |
Specifications
| Size | 18650 |
| Voltage | 3.6 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 4000 |
| Watt Hours (wH) | 14.4 |
| Terminal Type | Button Top |
| Protected | true |
| Integrated Charge Port | No |
| Max. Discharge Rate | 5 |
| Equivalent Types | 168A, 18650, 19670, Protected 18650, Unprotected 18650 |
Unit Dimensions
| Length | 2.75 in (70 mm) |
| Diameter | 0.73 in (19 mm) |
| Weight | 1.76 oz (50 g) |
Certifications & Transport
| Certifications/Standards | ANSI, CE |
| Country Of Origin | China |
| HTS Code | 85076000 |
Packaging/Shipping Dimensions
| Length | 5.58 in |
| Width | 3.15 in |
| Height | 0.97 in |
| Shipping Weight | 0.14 lb |
Documents
Additional Details
| Packaging | Boxed |
| Warranty |
Nitecore 1 Year Warranty Battery Junction Warranty |
| Return Policy | Return Policy |
Bright Buys
- Reliable lithium chemistry with a 10 year shelf life
- Regarded as one of the highest quality CR123A batteries on the market
- Used in LED flashlights, alarm systems, ranger finders and more
- Cells are lightweight, durable and ideal for long term storage
- Jacket style may vary
- Ideal for low-drain applications that require a primary battery to provide constant power
- 10-year shelf life - stock up for emergencies!
- The best choice for consistent power, great in low-drain devices like remotes
- Safe and reliable - capable of performing in high or low temperatures
- 11-in-1 card sized tool fits in your wallet or on a keychain!
- Packed with handy tools including a screwdriver & 7 wrench settings
- Serrated saw and straight-edge knife for quick cutting jobs
- Can + bottle openers for campsite meals or end-of-shift relaxation
- Four-channels saves time by charging multiple batteries at once.
- Capable of charging multiple chemistries by automatic battery detection.
- LCD display reveals the charging progress, battery type, voltage, and charging current.
- Automatic power-off function cuts off the current when charging is complete.
- Extremely compact and powerful EDC
- Max output of 3,000 lumens with a max throw of 229 meters
- Dual fuel and available with extender for use with a 26650
- Equipped with 4 x CREE XPG3 LEDs for maximum illumination
- 225mAh capacity drives long runtimes for watches and electronics
- CR2032 coin cells packed with 3V of power
- Convenient 6-piece retail card provides backup batteries
- Easily replaceable primary lithium cells
- Top recommended battery for Apple AirTags
- 3,000 lumens and a 250-meter throw - fierce illumination to light up your backyard
- Multiple output modes are accessible via easy side switch operation
- Strobe, SOS, and beacon modes offer distinct signaling capability
- High-capacity battery supports the light with a maximum 227-hour runtime
- Upgraded to output up to 3,100 lumens with a 1,000ft throw for optimal spotting!
- Offers fast, direct USB-C recharging from outlets, power banks, and more
- Ultra-slim design provides an easy-to-hold, simple EDC lighting solution
- OLED screen monitors performance, including charge level, brightness & beyond
- Pre-shrink wrapped Panasonic CR123A batteries great for OEM use & more
- 1550mAh high capacity keeps lights, alarms & more running longer
- Lithium cells with stable 3V output and strong discharge performance
- Storage life of up to 10 years ensures backups remain ready for use

















