NITECORE UNK2 Dual Slot USB Charger for Nikon Camera Batteries User Manual


UNK2 Dual Slot USB Charger for Nikon Camera Batteries

  • Real-time Info Display
  • Automatic Adoption of Charging Modes
  • Overcharge and Over-Discharge Protected


Thank you for purchasing! Before using this charger, please find your verification code on the package box, and go to (or scan the QR code beside the verification code to visit on your mobile phone). Type in your verification code and personal information as required, and submit the page. After verification, Nitecore will send you a warranty service email. This email and your registration email address are essential to your possible warranty application. Before you complete the warranty service registration, you cannot enjoy our warranty service for your purchase.

UNK2 User Manual


  • Dual slot charger for Nikon camera batteries
  • Compatible with Nikon EN-EL15/EN-ELI5a/EN-ELI5b batteries
  • USB input port
  • Real-time information on battery voltage, charging current, battery temperature, battery level, and other parameters
  • Monitors battery status and displays battery health
  • Reverse polarity protection and anti-short circuit protection
  • Automatic adoption of the optimal charging modes between CC and CV
  • Automatic adoption of charging current
  • Automatic termination upon charging completion
  • Activates over-discharged batteries with protective circuits
  • Compatible with power banks, 5V solar panels, and USB adapter
  • Made from durable and fire retardant PC materials
  • Optimal heat dissipation design
  • Insured worldwide by Ping An Insurance (Group) Company of China, Ltd


Input: DC 5V / 2A
Output Voltage: Slot 1 8.4V*1% Slot 2 8.4V*1%
Output Current: 1000mA (MAX)
Interface: Input:USB Output:  Connector


Battery compatibility:

Nikon camera battery EN-EL15/EN-EL15a/EN-EL15b

Compatible camera model:

Nikon D500, Nikon D600, Nikon 0610, Nikon D750, Nikon D800,
Nikon D800E, Nikon D810, Nikon D810k Nikon D850, Nikon D7000,
Nikon D7100, Nikon D7200, Nikon D7500, Nikon 1V1, Nikon V1,
Nikon Z6, Nikon Z7, Nikon D780, Nikon Z5, Nikon Z 611,
Nikon Z 711
Nikon Z 711 85mmx5Ommx25.5mm (3.35″x1.97″x1″)
Weight: 66g (2.33oz)

Operating Instructions

This product is designed specifically for Nikon EN-ELIS/EN-ELISa/EN-EL15b camera batteries. The UNK2 supports charging batteries in both slots simultaneously. The output current is adjusted automatically according to the input current to reach an optimal charging setting. This product shall NOT be used with other batteries not specified in this manual.

Automatic Current Adjustment

The UNK2’s actual output current depends on the maximum power supplied from the USB power source. The output current will get adjusted based on the actual power being input to the device. The UNK2 is capable of outputting 1000mA, increasing its efficiency while shortening charging time.

Battery Status Monitoring

Once the battery is inserted, the UNK2 will proceed with an initial low current test charge to diagnose the battery status. After the diagnosis, the battery status will be shown as Good, Normal, or Poor.Note: Re-insert the battery when “Poor” appears on screen to avoid the odd of poor battery contact, replace the battery if “Poor” comes up on the screen consistently.

Reverse Polarity and Anti-Short Circuit Protection

The UNK2 makes use of mechanical reverse polarity protection. Inserting incompatible batteries or incorrect battery installation will prevent the initiation of the charging process. The error message “EE EE” will come up on the LCD display when a short-circuited battery is installed.

Battery Recovery

The UNK2 will attempt to recover over-discharged batteries when inserted in the charging slot. Upon successful battery recovery, the entire battery level indicator will flash to represent that a battery has been successfully recovered.Note: This feature only works with protected batteries.


  1. The UNK2 is only compatible with Nikon EN-E1_15/EN-EL15a/EN-EL15b camera Do NOT attempt to charge other batteries.
  2. Moderate heat from this product is to be expected during the charging process, which is normal.
  3. Operating temperature: -10°^, 40°C, storage temperature: -20° eY 60° C.
  4. Carefully read all labels on the device to ensure batteries are installed correctly.
  5. Please connect this charger to power supplies with the input voltage stated in the specifications of the user manual. If the input voltage is too low or too high, it may lead to malfunctions or even a fire.
  6. DO NOT charge batteries if there is any sign of faulty or short circuit.
  7. The charger is designed for adults. Use of the charger by kids under age must be under supervision. Operation, using, or cleaning of the charger may NOT be done by kids aged 8 years or younger.
  8. DO NOT leave the product unattended while it is connected to a power supply. Unplug the product at any sign of malfunction and refer to the user manual.
  9. Batteries of a short lifespan should be replaced as soon as possible.
  10. DO NOT expose the device to high temperature or incinerate, avoid using the device in environments where drastic changes in temperature are possible.
  11. Store the device in ventilated areas. DO NOT use the device in a moist environment and keep away from any combustible materials.
  12. Avoid any shock or impact on the device.
  13. D0 NOT place any conductive or metal object in the device to avoid short-circuiting and explosions.
  14. Unplug the device and remove batteries when it is not in use.
  15. D0 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.
  16. D0 NOT misuse in any way! Use for intended purpose and function only.


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 occur, 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 qualified for a 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 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 nullified if the product(s) is/are:

  1. broken down, reconstructed, and/or modified 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 specified herein this user manual are for reference purpose only. Should any discrepancy occurs between this manual and information specified on, information on our official website shall prevail. SYSMAX Innovations Co., Ltd. reserves the right to interpret and amend the content of this document at any time without prior notice.

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SYSMAX Innovations Co., Ltd.TEL: +86-20-83862000 FAX: +86-20-83882723 E-mail: [email protected] Web: Address: Rm 2601-061 Central Tower, No.5 Xiancun Road, Tianhe District, Guangzhou, 510623, Guangdong, China Manufacturer: SYSMAX Power Technology, LLC

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