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Nitecore E4K Flashlight 4400 Lumen USB Rechargeable 21700 LED Flashlight

Model: NC-E4K
Manufacturer: NITECORE Flashlight
Retail: $108.00
In stock (Usually Ships in 24-48 Hours)


A powerful, EDC powerhouse, the Nitecore E4K packs an impressive 4400 lumen maximum output from 4 x CREE XP-L2 V6 LEDs powered by a single USB-C Rechargeable 21700 (5000 mAh) battery. It can also be powered by (R)CR123 for versatility if the need arises. Perfect for everyday carry, the E4K is also great for hiking, camping or other outdoor activities thanks to the durable CNC machined Unibody aluminum construction with black hard anodized finish with high traction knurling, cooling fins and tail-stand capability. Features include:

  • Crystal and Double Anti-scratch coated Lens
  • Precision Digital Optics Technology
  • High Efficiency Constant Current Circuit
  • Randomized Frequency Strobe
  • Power indicator under side switch
  • Reverse polarity protection
  • Advanced Temperature Regulation (ATR)
  • Aero grade aluminum body
  • Mil-Spec HA III hard anodized coating.

Brand new, direct from Nitecore Flashlights.

Includes: E4K, 21700 Battery, USB-C charging cable, CR123 Battery Magazine, Clip, Holster, Lanyard, Spare O-Ring.


  • Hold: Turn On/Brightness Adjustment
  • Short Press: Power Indication
  • Double Press: Direct to Ultra Low
  • Triple Press: Direct to Turbo/Strobe

Output and Run-times

  • Turbo: 4400 lumens - 211min*
  • High: 1050 lumens - 3h 15min
  • Med: 320 lumens - 7h 30min
  • Low: 50 lumens - 45h
  • Ultra Low: 2 lumens - 700h
  • Strobe: 4400 lumens - N/A
  • SOS: 4400 lumens - N/A
  • Beacon: 4400 lumens - N/A
*Runtime tested without temperature regulation.


Bulb Type CREE XP-L2 V6 LED
Max Output 4400 lumens
High Output 1050 lumens
Medium Output 320 lumens
Low Output 50 lumens
Max Runtime 700 hours
Min Runtime 0.50 hours
Beam Distance 692.3 feet
Impact Resistance 1 meters
Waterproof 2 meters
Body Material Aluminum
Overall Length 4.63"
Bezel Diameter 28.6 mm
Body Diameter 28.1 mm
Weight 2.82 oz.
Sheath Nylon
Country of Manufacture China