Nitecore UM4 Intelligent USB Battery Charger – 4 Slot Fast Charger
The Nitecore UM4 Intelligent Charger is a powerful four-slot USB battery charger designed for fast, efficient, and safe charging of a wide range of rechargeable batteries. With the ability to charge up to four batteries simultaneously and control each charging bay independently, the UM4 is ideal for users who need reliable multi-battery charging for vape batteries and other rechargeable cells.
The charger offers a maximum output of 1500mA in a single slot when connected to a 9V 2A QC 2.0 adapter, enabling faster charging speeds compared to standard USB chargers. It also features a charging programme specially optimised for IMR batteries, carefully monitoring the entire charging process to ensure safe cut-off voltage and extend battery lifespan.
The integrated LCD display provides detailed real-time charging information, giving users full visibility over battery performance and charging progress.
Key Features
- Four-slot intelligent battery charger
- Independent charging control for each slot
- Maximum output of 1500mA per slot
- Supports QC 2.0 fast charging (9V 2A adapter required)
- Optimised charging programme for IMR batteries
- Intelligent charging management for improved battery lifespan
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Real-time LCD display showing detailed charging information
- Automatic battery detection and charging mode selection
- Manual charging parameter adjustment available
LCD Display Information
Press the “V” button to cycle through the following real-time information:
- Charged capacity and charging time
- Charging current and battery voltage
- Battery type
- Cut-off voltage
- Charging mode
The charger automatically selects one of three charging modes depending on battery type and capacity. Users can also manually adjust settings by long pressing the “C” button to enter charging configuration mode.
Battery Restoration Function
The Nitecore UM4 supports over-discharged IMR battery restoration.
- If an over-discharged battery is inserted, the screen displays “EE EE”
- Long press the “V” button to enter battery restoration mode
The “EE EE” warning will also appear if:
- A battery is inserted incorrectly (reverse polarity)
- A battery is short-circuited
Compatible Battery Types
The Nitecore UM4 supports a wide range of rechargeable batteries.
Li-ion / IMR / LiFePO4 Batteries:
- 10440
- 14500
- 14650
- 16340 (RCR123)
- 16500
- 16650
- 17350
- 17500
- 17650
- 17670
- 17700
- 18350
- 18490
- 18500
- 18650
- 18700
- 20700
- 21700
- 22500
- 22650
- 25500
- 26650
- 26700
NiMH / NiCd Batteries:
Safety Features
- Intelligent charge monitoring
- Automatic charging cut-off
- Reverse polarity protection
- Short-circuit detection
- Battery health monitoring
The Nitecore UM4 is an excellent choice for users who need a versatile, high-performance multi-battery charger with advanced monitoring, fast charging capability, and wide battery compatibility.