The UMS4 is the big brother of the UM4 charger. The main differences are mainly the higher charging current, now up to 3A in *QC (Quick Charge) mode on one slot possible with two occupied slots max. 2A per slot and 1A per slot for 4 slots. (1000mA are preset) To make the high currents safer the Nitecore UMS4 charger has been equipped with additional features, recognises the battery type, determines the battery condition, the charging status of the battery and automatically determines the correct charging procedure. Good" and "Poor" display completes the battery monitoring.

The UMS4 from Nitecore is equipped with QC 2.0 (Quick Charge) charging electronics.

Nitecore renounced with the UM series integrated power supply and integrated the charger the *QC 2.0 (Quick Charge) at the USB input. Charging of batteries up to a length of 77mm e.g..Protected 20700/21700 batteries, automatic battery internal resistance detection, calculation of charged capacity and Li-Ion battery reactivation are further useful additions.
Enables charging of Li-Ion, Ni-MH, Ni-Cd and LiFePO4 batteries. The charging system is optimised for IMR batteries and charges the batteries safely and gently. The LCD display shows charging current, charging voltage, resistance and charging time per charging slot. CE, FCC, ROHS and CEC certified.

The following battery types can be charged with the Nitecore UMS4:

Li-Ion/LiFePO4:10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490,
18500, 18650, 18700, 20700, 21700, 22500, 25500, 26500, 26650, 26700 charging slot length 77mm.

Ni-MH/Ni-CD:AA, AAA, AAAA, C, D
Please note:  For rechargeable batteries with a diameter of 22 mm or more, max. two cells can be charged at the same time.

Nitecore UMS4 Product information:

• Intelligent 4 slot charger
• Manual selectable charging current.
• Integrated *QC 2.0 processor
• Automatic battery internal resistance detection
• Charged capacity calculation
• Energy saving function
• Reactivation of deeply discharged batteries (observe operating instructions)
• Time-controlled overcharge protection
• Four charging slots - can be used independently of each other
• Optimised, intelligent temperature monitoring
• Housing made of flame-retardant ABS plastic
• Intelligent reverse polarity and overcharge protection
• Microprocessor-controlled charging process that protects and monitors the batteries against overcharging
• Independent recognition of battery type (Li-Ion, Ni-MH or Ni-Cd) LiFePo4 manually switchable
• The charging method (CC, CV or dV/dt) is automatically selected according to the detected battery type.
• Charging current is adapted to the detected state of charge of the battery

Scope of delivery: 1x NiteCore UMS4, 1x USB cable, user manual in German, English, Spanish, French, Russian, Italian and Romanian
(USB power supply not included).

Instruction manual: Nitecore UMS4.pdf

Further information about the UMS4 charger from Nitecore.

For *Quick Charge charging mode (see "Technical data) a QC USB power supply is required Suitable power supplies: Art. No.: 400617, 400622
Many newer smartphones are already supplied with QC power adapters.
Please make sure that you already have a QC power adapter before you order a new one.
For standard charging mode (see "Technical data), a 2.1V power adapter is sufficient. Suitable power supply units: Art. No.: 400609, 400610, 400611, 400616

*QC 2.0 (Wikipedia)

• Charging current QC mode:        3000mA x 1 (max); 2000mA x 2 (max); 1000mA x 4 (max) can be adjusted manually in 100mA steps
• Charging current standard mode: 2000mA x 1 (max); 1000mA x 2 (max); 500mA x 4 (max) can be adjusted manually in 100mA steps
• Input voltage: DC 5V/2A 9V/2A 18W (MAX)
• Output voltage: 4.35V ± 1% / 4.2 V ± 1 % / 3.7 V ± 1 % / 1.48 V ± 1 %
• Dimensions: 159 mm × 107 mm × 41 mm
• Weight: 255.4 g (without batteries and USB cable)
• Reverse polarity protection
• Automatic limit switch