Nitecore UM4 rechargeable battery charger (Nitecore, SKU: UM4) is an intelligent four-slot charger designed for Li-ion, IMR, LiFePO4, Ni-MH and Ni-Cd rechargeable batteries. Four independently controlled slots allow different batteries to be charged simultaneously, while the LCD displays the key parameters and charging progress of each one. When powered by a QC 2.0 compatible source, the maximum charging current in one slot is 1,500 mA.

Key features

• four independently controlled charging slots
• maximum charging current of 1,500 mA for one battery
• simultaneous charging of four batteries at up to 750 mA per slot in QC Mode
• automatic detection of battery type and capacity and selection of the appropriate charging parameters
• manual adjustment of charging current and cut-off voltage
• LCD displaying battery health, internal resistance, current, voltage, charged capacity and charging time
• automatic selection of CC, CV or –dV/dt charging mode
• activation of over-discharged batteries and restoration function for Li-ion batteries
• reverse polarity, short-circuit and overtime charging protection
• housing made of durable, fire-retardant PC material and construction supporting heat dissipation

Set contents

• Nitecore UM4 charger
• USB power cable

Technical specifications

• manufacturer: Nitecore
• model: UM4
• type: intelligent four-slot charger
• number of slots: 4
• slot control: independent
• input: DC 5 V / 2 A or 9 V / 2 A
• maximum input power: 18 W
• output voltages: 4.35 V ± 1%, 4.2 V ± 1%, 3.7 V ± 1% or 1.48 V ± 1%
• maximum current in QC Mode: 1,500 mA × 1, 1,500 mA × 2 or 750 mA × 4
• maximum current in Standard Mode: 1,500 mA × 1, 1,000 mA × 2 or 500 mA × 4
• supported rechargeable battery types: Li-ion, IMR, LiFePO4, Ni-MH and Ni-Cd
• compatible Li-ion / IMR / LiFePO4 sizes: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650 and 26700
• compatible Ni-MH / Ni-Cd sizes: AA, AAA, AAAA, C and D
• dimensions: 159 × 107 × 41 mm
• weight: 232.8 g, excluding the cable

The Nitecore UM4 enables controlled charging of many popular rechargeable battery types, while its four independent slots and clear display make the entire process easier to monitor.