The UM series with LCD display is a new future based concept strategy from Nitecore.
Nitecore did without an integrated power supply for the UM4 and integrated the charger with *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 the charged capacity and Li-Ion battery reactivation are further useful additions.

Intelligent universal charger Nitecore UM4 for almost all battery types.

Allows charging of Li-Ion, Ni-MH, Ni-Cd and LiFePO4 batteries. With a charging system optimised for IMR batteries, the batteries are charged 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 UM4:

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 UM4 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
• 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 the battery type (Li-Ion, Ni-MH or Ni-Cd) LiFePo4 manually connectable
• 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 UM4, 1x USB cable, instruction manual in: German, English, Spanish, French, Russian, Italian and Romanian
(USB power supply not included).

Instruction manual: Nitecore-UM4.pdf

Further information about the UM4 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.
A 2.1V mains adapter is sufficient for the standard charging mode (see "Technical data"). Suitable power supply units: Art. No.: 400609, 400610, 400611, 400616

*QC 2.0 (Wikipedia)

• Charging current QC mode:        1500mA x 1 (max); 1500mA x 2 (max); 750mA x 4 (max)
• Charging current standard mode:  1500mA x 1 (max); 1000mA x 2 (max); 500mA x 4 (max)
• 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: 232.8 g (without batteries and USB cable)
• Reverse polarity protection
• Automatic limit switch