Manual Nitecore UM4 Battery Charger
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(English) UM4 User Manual
8. DO NOT leave the product unattended while it is connected to a power supply. Unplug the product at any sign of
malfunction.
9. Please make sure the correct program and settings are chosen and set. Incorrect program or setting may damage
the charger, or cause re and explosion.
10. DO NOT attempt to charge primary cells such as Zinc-Carbon, Lithium, CR123A, CR2, or any other unsupported
chemistry due to risk of explosion and re.
11. DO NOT charge a damaged IMR battery as doing so may lead to charger short-circuit or even explosion.
12. DO NOT charge or discharge any battery having evidence of leakage, expansion/swelling, damaged outer wrapper
or case, color-change or distortion.
13. Use the original adapter and cord for power supply. To reduce the risk of damage to the power cord, ALWAYS pull
by the connector rather than the cord. DO NOT operate the charger if it appears damaged in any way.
14. DO NOT store or use the product in an environment where the temperature is extremely high / low or changes
rapidly, or in a conned area with a high temperature.
15. Store the device in ventilated areas. DO NOT use the device in moist environment and keep away from any
combustible materials.
16. Avoid any shock or impact to the device.
17. DO NOT place any conductive or metal object in the device to avoid short circuiting and explosions.
18. DO NOT overcharge or over-discharge the batteries. Please recharge the battery as soon as the power runs out.
19. Unplug the device and remove all batteries when it is not in use.
20. DO NOT disassemble or modify the device as doing so will render the product warranty invalid. Please refer to the
warranty section in the manual for complete warranty information.
21. DO NOT misuse in any way! Use for intended purpose and function only.
Disclaimer
This product is globally insured by Ping An Insurance (Group) Company of China, Ltd. NITECORE shall not be
held responsible or liable for any loss, damage or claim of any kind incurred as a result of the failure to obey the
instructions provided in this user manual.
Warranty Details
Our authorized dealers and distributors are responsible for warranty service. Should any problem covered under
warranty occurs, customers can contact their dealers or distributors in regards to their warranty claims, as long as the
product was purchased from an authorized dealer or distributor. NITECORE’s Warranty is provided only for products
purchased from an authorized source. This applies to all NITECORE products. To be qualied for warranty, please refer
to the “IMPORTANT WARRANTY NOTICE” section on top to validate your product.
Any DOA / defective product can be exchanged for a replacement through a local distributor/dealer within the 15
days of purchase. After 15 days, all defective / malfunctioning NITECORE
®
products can be repaired free of charge
for a period of 12 months (1 year) from the date of purchase. Beyond 12 months (1 year), a limited warranty applies,
covering the cost of labor and maintenance, but not the cost of accessories or replacement parts.
The warranty is nullied if the product(s) is/are:
1. broken down, reconstructed and/or modied by unauthorized parties
2. damaged from wrong operations (i.e. reverse polarity installation, installation of non-rechargeable batteries or
failure to obey the warnings)
3. damaged by batteries leakage.
For the latest information on NITECORE
®
products and services, please contact a local NITECORE
®
distributor or send
an email to [email protected].
※ All images, text and statements specied herein this user manual are for reference purpose only. Should any
discrepancy occur between this manual and information specied on www.nitecore.com, information on our ocial
website shall prevail. SYSMAX Innovations Co., Ltd. reserves the rights to interpret and amend the content of this
document at any time without prior notice.
Safety Instruction for Lithium-ion Batteries
1. Charging Voltage
Lithium-ion (Li-ion) batteries have strict requirement on voltage control. Charging Li-ion batteries with electric voltage
beyond safety standard can lead to battery damage and explosion.
(1) 3.7V Li-ion Batteries / IMR Batteries
3.7V Li-ion batteries are the most common rechargeable Lithium batteries. The skins of these batteries are often
marked with 3.6V/3.7V signs. If our chargers judge that an inserted battery is a Li-ion battery, the battery will be
automatically charged in 4.2V standard charging mode. You do not need extra voltage settings for these types of
batteries.
(2) 3.8V Li-ion Batteries
3.8V Li-ion batteries are comparatively rare. It usually has a 3.7V mark on its skin. Normally its seller will inform
its buyer that it needs to be charged with 4.35V power. When charging this type of battery, please manually set
the charging voltage to 4.3V, otherwise the charger will charge at 4.2V by default, and cannot provide adequate
charging voltage.
(3) 3.2V LiFePO4 Batteries
3.2V LiFePO4 batteries have LiFePO4 and/or 3.2V marks on the skin. Be careful with this type of batteries. Without
manual setting, our chargers will charge this type of batteries with 4.2V, and will damage or even explode the
battery with excessive charging voltage. You need to manually set the charging voltage to 3.7V for safe charging.
2. Charging Current
For all rechargeable Lithium batteries (including Li-ion, IMR and LiFePO4 batteries), we suggest not using current
larger than 1C* for charging. For small capacity batteries, the charging current must be smaller than 1C.
* C=Capacity of a battery. For example, 1C in a 2600mAh rechargeable Lithium battery is 2.6A. 1C in a 3400mAh
rechargeable Lithium battery is 3.4A.
Excessively large charging current will lead to great amount of heat, and consequently battery damage and explosion.
Warning: Our chargers automatically judge and select charging current by the batteries’ length. For some
long but small capacity batteries (i.e. 12650, 13650, 14650, 16650), please manually set appropriate
charging current (smaller than 1C).
3. Precautions
(1) DO NOT short circuit the battery in any way.
(2) DO NOT use a 3.7V/3.8V Lithium battery when its voltage is lower than 2.8V, otherwise it can be over-discharged,
and/or prone to explosion at next charging.
(3) We strongly recommend batteries with protective circuit. For batteries without protective circuit (such as IMR
batteries), please stay alert for over-discharge and short circuit.
(4) DO NOT discharge a battery with a discharging current larger than its maximum rated current.
4. Long-term Storage
The best storage voltage for 3.7V/3.8V rechargeable Lithium batteries is 3.7V. Voltage too low or too high can damage
your battery during storage. You can discharge a battery to 3.7V, or charge it to 3.7V in a charger before you keep it
in long-term storage.
Validation code and QR code on package can be veried on NITECORE website.
The charger must be used with NITECORE’s ocial cords. Ocial cords are identied with clearly printed
NITECORE on the plug. During charging, third party cords can cause malfunction, overheat and even re
on the charger. Damages from using unocial cords cannot be covered by ocial warranty.
The charger is restricted to charging Li-ion, IMR, 3.2V LiFePO4, Ni-MH/Ni-Cd rechargeable batteries only.
DO NOT use the charger with other types of batteries as this could result in battery explosion, cracking or
leaking, causing property damage and/or personal injury.
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Specifications
| Brand | Nitecore |
| Model | UM4 |
| Category | Battery Chargers |
| File type | |
| File size | 1.19 MB |
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