NITECORE MH40 User Manual
User manual, Features, Dimensions

®
User Manual
Features
• Premium CREE XM-L U2 LED
• Maximum output of 900 lumens
• High efficiency regulation circuit 
• Maximum runtime of up to 105 hours
• Intelligent charging circuit with voltage detection charges safely and rapidly
• Integrated charging port is water, dust and impact resistant
• Multiple output modes are conveniently accessed via rapid rotary switch
• User-defined mode provides customized brightness levels plus strobe and SOS modes.
• Intelligent memory function stores preferred brightness setting
• Broad voltage circuit accepts both rechargeable and non-rechargeable Lithium 
batteries
• Optimized ultra-precise reflector offers a longer beam distance than competing
products
• Waterproof in accordance with IPX-8 (submersible to two meters)
• Stainless steel bezel ring protects core components from damage
• Toughened ultra-clear mineral glass with anti-reflective coating
• Constructed from aerospace-grade aluminum alloy
• HAIII military grade hard-anodized
• Reverse polarity protection
• Stainless steel titanium-plated clip 
• Anti-rolling design
Dimensions
Length: 243mm (9.6”)
Head Diameter: 60mm (2.36”)
Tail Diameter: 25.4mm (1”)
Weight: 311grams (11oz)(without battery)
Thanks for purchasing NITECORE!
SYSMAX Industry Co., Ltd.
TEL:
+86-20-83862000
FAX:
+86-20-83882723
E-mail:
Web:
www.nitecore.com
Address: Rm1407-08, Glorious Tower, 850 East Dongfeng Road,
Guangzhou, China 510600
Battery Options
ALL-ROUND Flashlight Expert
Operation instructions
Battery installation (see adjacent diagram)
1. Unscrew the tail cap in a counter-clockwise
direction.
2. Insert two 18650 battery or four CR123 
 batteries with the positive pole pointing 
 forward (toward the light head).
NOTES:
1. Insert batteries with the positive (+) end 
 pointing toward the flashlight head.
2. Do not mix rechargeable and 
 non-rechargeable batteries.
3. Do not mix batteries of different 
 types/brands.
4. Do not mix batteries of different charge levels.
Charging indicator light
1. Connect the charging cable to the flashlight and the A/C power adapter to the wall 
outlet as shown in the adjacent image. Fully charging two depleted 18650 batteries 
takes approximately 4 hours.
2. Under normal charging conditions, the red indicator light near the charging port will
blink twice every second.
3. If a problem is detected during the charging process, the MH40 will stop charging
and the red indicator will blink rapidly. This is usually caused by faulty or incorrectly 
inserted batteries.
4. When charging is complete, the red indicator will illuminate steadily.
Accessories
Two Nitecore 18650 Li-ion battery(NL183), 
tactical ring, lanyard, charger, clip, holster, 
spare switch cap and spare O-ring
*Warning:
Charge 18650 rechargeable Li-ion batteries only, do not attempt to
charge non-rechargeable batteries, CR123 or RCR123 batteries.
Brightness & Runtime
TURBO
HIGH
MID
LOW
LUMENS
320
LUMENS
900
LUMENS
105
LUMENS
18
105
h
22
h
1
h
15
min
4
h
30
min
5
h
30
min
70
h
17
h
1
h
490m
(Beam Distance)
60000cd
(Peak Beam Intensity)
IPX-8, 2m
(Waterproof AND Submersible)
1.5m
(Impact Resistant)
4×
CR123
2×
18650
NOTICE
Stated data has been 
measured according to the 
international flashlight testing 
standards ANSI/NEMA FL1 
using two quality NITECORE 
18650 (3.7V 2600mAh) 
battery or four SYSMAX 
CR123 (3V 1550mAh) 
batteries under laboratory 
conditions. The data may 
vary due to individual usage 
habits and environmental 
conditions.
NITECORE (SYSMAX) is a member of PLATO, participating in and helping to develop
the ANSI FL1 standard of measurement. Product testing data is in accordance with 
these internationally recognized scientific standards.
Cautions:
1. The MH40 needs to be turned on 
in order to enter charging mode. 
2. Do not charge batteries of 
different types or different brands 
together.
Switching ON/OFF
To switch ON: Press the button on the tailcap until a “click” is heard.
To switch OFF: Press the button on the tailcap a second time until a “click” is heard. 
Mode Switching
The Nitecore MH40 has two modes: Turbo and user-defined. These two modes can 
be changed by simply tightening and loosening the flashlight head. Turbo provides 
100% output while user-defined contains five selectable sub-modes. 
Turbo Mode
Turbo mode provides an output of 900 lumens and is accessed when the flashlight is 
switched ON with the head lightly tightened. While in this mode, momentary 
illumination can be achieved by switching off the flashlight and then half pressing and 
holding the switch. 
User-Defined Mode
User-defined mode is accessed by slightly loosening the flashlight head. In this mode, 
lightly and rapidly pressing the switch will cycle through brightness and other 
functions in the following order: “High-Mid-Low-SOS-Strobe”. Pressing the switch all 
the way down will save and memorize a desired setting.
Tips: Make NITECORE MH40 your perfect Multitask Hybrid flashlight.
NITECORE MH40 flashlights essentially have two modes: Turbo mode (100% output) 
and custom mode. Turbo mode is accessed by tightening the flashlight head while 
any of the five customizable modes (strobe, SOS, low, medium and high) are selected 
by loosening the head and rapidly pressing the on/off switch to cycle through the 
modes. A given mode can be saved by simply turn off the light while in that mode. 
Real-world examples include: When used as a flashlight around the home, the head 
can be loosened and low level selected in custom mode, providing long runtimes at a 
lower light intensity. The same flashlight could then be taken out and used a 
law-enforcement duty light, with user-defined mode set in strobe, making it easy to 
alternate between turbo mode and strobe with a simple twist of the flashlight head.
Maintenance
Every 6 months, threads should be wiped with a clean cloth followed by a thin coating 
of silicon-based lubricant.
Warranty Service
All NITECORE® products are warranted for quality. DOA / defective products can be 
exchanged for replacement though a local distributor/dealer within the 14 days of 
purchase. After 14 days, all defective / malfunctioning NITECORE® products will be 
repaired free of charge for a period of 18 months from the date of purchase. After 18 
months, a limited warranty applies, covering the cost of labor and maintenance, but 
not the cost of accessories or replacement parts. The warranty is nullified in all of the 
following situations:
1. The product(s) is/are broken down, reconstructed and/or modified by unauthorized 
parties.
2. The product(s) is/are damaged through improper use.
3. The product(s) is/are damaged by leakage of batteries.
For the latest information on NITECORE® products and services, please contact your 
national NITECORE® distributor or send an email to [email protected]
Charging Function
The MH40 is capable of charging two protected 18650 Li-ion batteries via the included 
DC3.5 charging cable. Simply install the protected 18650 Li-ion cells, plugging one 
end of the charging cable into the flashlight and the other end into a adaptor and the
MH40 will take care of the rest.
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SIZE
Nominal voltage
Compatible
Primary Lithium battery *
CR123
3V
Yes (Compatible but can
NOT be recharged)
Yes (Compatible but can
NOT be recharged)
18650 Rechargeable Li-ion battery
18650
3.7V
Yes (Compatible and
can be recharged)
Rechargeable Li-ion battery *
RCR123
3.7V
