User manual for the Nitecore UM4 battery charger, covering four slots, QC 2.0 charging, battery compatibility, settings, and safety features.
The Nitecore UM4 is a USB battery charger with four independently controlled slots and QC 2.0 fast charging. It supports Li-ion, Ni-MH/Ni-Cd and LiFePO4 batteries and automatically detects battery type and capacity, with manual settings for cutoff voltage and charging current.
The manual describes connecting the charger to a USB power source, inserting batteries, reading the LCD status, and handling error indications. It also covers button controls, charging current and voltage settings, internal resistance display, activation and recovery functions, and protection features. This manual is written in Russian.
| Input | 5 V/2 A or 9 V/2 A, 18 W max |
|---|---|
| Output | 4.35±1% V / 4.2±1% V / 3.7±1% V / 1.48±1% V |
| Fast charging mode | 1500 mA x1 max, 1500 mA x2 max, 750 mA x4 max |
| Standard mode | 1500 mA x1 max, 1000 mA x2 max, 500 mA x4 max |
| Compatible Li-ion/LiFePO4 sizes | 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 Ni-MH/Ni-Cd sizes | AA, AAA, AAAA, C, D |
| Dimensions | 152 x 73 x 40 mm (5.98 x 2.87 x 1.57 in) |
| Weight | 232.8 g (8.21 oz), without charging cable |
The UM4 supports Li-ion and Ni-MH/Ni-Cd batteries with automatic detection.