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NITECORE UMS2 Intelligent USB Dual-Slot Superb Battery Charger for AA AAA 14500 16340 18650 21700 20700 batteries and more
NITECORE UMS2 Intelligent USB Dual-Slot Superb Battery Charger

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Price: $28.95

Availability: Usually Ships in 24 Hours
Product Code: CHG-NITE-UMS2

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1x Nitecore IMR3100-35A [Add $16.95]
2x Nitecore IMR3100-35A [Add $33.80]

Charging Adapter:
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Add a Quick Charge 3.0 USB AC Power Adapter [Add $9.99]



  • Capable of charing 2 batteries simultaneously & controlling each slot independently
  • Charging speed up to 3,000mA in a single slot
  • Automatically detects battery power level and selects the appropriate voltage & charging mode
  • LCD display shows real time charging information
  • Built in safety protections to prevent short circuits, overcharging, and improperly inserted batteries
  • Compatible with USB adapters, power banks, solar panels and more.

Included in the Box

  • NITECORE UMS2 Charger
  • micro USB charging cable

Quick and Efficient Charging

Introducing the NITECORE UMS2 Intelligent USB dual-slot charger designed to recharge your batteries fast, safe and efficiently. The UMS2 will reach a maximum total output of 4000mA when using a 2A output USB power adapter. When the charger is powered or connected to quick charge (QC) power adapter, the screen will show “Quick Charge” and the single slot will achieve a max output of 3000mA.

LCD Display with Real-time Charging Information

A brightly lit LCD display reports real information including battery health, charging time, charged volume, charging current, battery voltage and type, cut-off voltage and charging mode. The UMS2 offers an energy saving function that activates and dims the LCD display in 10 minutes, when there is no action to the buttons or batteries.

Intelligent USB Charging

The UMS2’s intelligent charging technology automatically detects and applies the appropriate charging current/voltage while allows users to manually adjust the charging current/voltage for specialized battery types. The UMS2 supports various battery types (li-ion/imr/lifep04/ni-cd/ni-mh) and common battery sizes including (18650, 16340,14500).


Input DC 5V/2A 9V/2A / 18W(MAX)
Output4.35V±1% / 4.2V±1% / 3.7V±1% / 1.48V±1%
Output Current QC Mode3,000mA*1 (MAX) 2,000mA*2 (MAX)
Output Current Standard Mode2,000mA*1 (MAX) 1,000mA*2 (MAX)
Compatible Battery Types: IMR/Li-ion/LiFePO410440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700
Compatible Battery Types: Ni-MH/Ni-CdAA, AAA, AAAA, C, D
Maximum Brightness---- --
Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 18 Write a review »

  0 of 0 people found the following review helpful:
1 of 5 Doesn't Work Properly January 29, 2020
Reviewer: bertson from Schnecksville, PA UnScjmeclsited States  
Something wrong right out of the box. After placing 2 Nitecore batteries in the charger it would only recognize Slot 2.  After 15 minutes of playing with the Slot 1 battery it became clear the ends were not making adequate contact for it to recognize the battery was in Slot 1.  Slot 2 battery charged fine. Slot 1 battery meter never provided a full charge reading (regardless of which slot it was in).  Can't tell if the unit is defective or there is something wrong with the battery.  The User Manual provides no troubleshooting guidance. I had to watch YouTube videos to try and understand how it's supposed to work.  Definitely not worth the money if this is how it actually works (despite all the reviews I read prior to purchasing it).  If it's defective they should replace it.

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  0 of 0 people found the following review helpful:
5 of 5 January 21, 2020
Reviewer: Nicholas Heilbron from Lompoc, CA United States  

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  1 of 1 people found the following review helpful:
5 of 5 Nitecore UMS2 Intelligent Charger Lives Up To Name December 15, 2019
Reviewer: John M from Michigan  
I purchased the Nitecore UMS2 charger for the sole purpose of charging my standard 21700 batteries.
However, I did have an Olight 21700 battery which was proprietary to Olight and could presumably only be charged using the Olight flashlight (Seeker 2).
Well, I inserted this Olight battery into the Nitecore charger to see if the charger would even recognize the batter since a different charger I owned (not a Nitecore) did not recognize the battery.
The Nitecore charger not only recognized the battery, but it charged it fully in a matter of hours.
This charger is top-notch, and I highly recommend it to anyone looking for a charger which can handle all types of rechargeable batteries.

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  1 of 1 people found the following review helpful:
5 of 5 Charger Upgrade! December 1, 2019
Reviewer: Anonymous Person from Sierra Madre, CA United States  
The UMS2 is my 3rd Nitecore charger and a necessary upgrade to accommodate the larger 21700 cells that are required to power my latest Zebralight SC700d flashlight. Both of my previous Nitecore chargers had 4 charging ports and both served me very well. I'm sure that they will continue to serve my 18650 batteries well into the future. Just as I am sure that this new charger will last for a very long time. Nitecore products are made to last and that's why I keep coming back. 5 Stars across the board for Nitecore products as well as the Nitecore Store. Great products and a great store equal happy return customers!

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  0 of 0 people found the following review helpful:
5 of 5 October 22, 2019
Reviewer: Richard Rodriguez from Bakersfield, CA United States  
It's a nice quality  Battery charger. It charges battery fast.👍👍👍👍👍 I recommend it

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