Home > Products > Batteries > Chargers >

NITECORE UMS4 Intelligent USB Four Slot Superb Battery Charger for AA AAA 14500 16340 18650 21700 20700 batteries and more
NITECORE UMS4 Intelligent USB Four-Slot Superb Battery Charger

Alternative Views:

Price: $38.95

Availability: Usually Ships in 24 Hours
Product Code: CHG-NITE-UMS4

Add a Battery and Save*:
No Battery Added
2x Nitecore IMR3100-35A [Add $33.80]
4x Nitecore IMR3100-35A [Add $67.60]

Charging Adapter:
No, Thanks! (Default)
Add a Quick Charge 3.0 USB AC Power Adapter [Add $9.99]



  • Capable of charing 4 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 USM4 Charger
  • micro USB charging cable

Quick and Efficient Charging

Introducing the NITECORE UMS4 Intelligent USB dual-slot charger designed to recharge your batteries fast, safe and efficiently. The UMS4 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 UMS4 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 UMS4’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 UMS4 supports various battery types (li-ion/imr/lifep04/ni-cd/ni-mh) and common battery sizes including (18650, 16340,14500).


Input DC 5V/2A 12V/1.5A / 18W(MAX)
Output 4.35V±1% / 4.2V±1% / 3.7V±1% / 1.48V±1%
Output Current QC Mode 3,000mA*1 (MAX) 2,000mA*2 (MAX) 1,000mA*4 (MAX)
Output Current Standard Mode 2,000mA*1 (MAX) 1,000mA*2 (MAX) 500mA*4 (MAX)
Compatible Battery Types: IMR/Li-ion/LiFePO4 10440, 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-Cd AA, AAA, AAAA, C, D
Dimensions L-6.26"xW-4.21"xH-1.61"
Weight 9.01oz
Average Rating: Average Rating: 4.5 of 5 4.5 of 5 Total Reviews: 12 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Charger usm4 February 11, 2020
Reviewer: Merle Dyer from Spanaway, WA United States  
Havent had time to review . Service was great.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Nice Charger January 29, 2020
Reviewer: Clint Cobb from wilmer, AL United States  
Works as expected

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Excellent Charger January 24, 2020
Reviewer: TonTEKy TEKKnight from Salem, OR SalemUnited States  
I'd read a ton of reviews and done a ton of research before making my kill...and this is a great product.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 charger January 19, 2020
Reviewer: ralph shelton from Highland Village, TX United States  
this has got to be the best charger on the market.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
3 of 5 Heats Ni-MH heavily, rather disappointing. January 14, 2020
Reviewer: Wojtek  
I bought this charger for both Li-Ion cells (mainy 18650) and Ni-MH (AA, AAA). I wanted a USB powered charger as I always have a multiport USB power suppy (both at home and while I travel). This charger seemed to check all the boxes (although USB C port would be nicer in something bought in 2019).
Initially I was satisfied with the charger as it charges both Li-Ion and Ni-MH fast. That is until I noticed the Ni-MH batteries to be hot when I picked them up after charging (especially AAAs). I use black Eneloops which are in good shape (checked with another charger) so this was unsettling.
What's more I often had problems with placing the AAs and AAAs in the charger properly. Just laying them in the bays often caused bad connection and false indication of a high internal resistance. This is caused by poorly shaped connectors.
If it comes to internal resistance value, the result seems to be almost random (the same battery can show different resistance when placed in different bays).

Was this review helpful to you?

View All Customer Reviews