1. Introduction
The Nitecore UMS2 is an intelligent USB dual-slot quick battery charger designed for a wide range of rechargeable batteries, including Li-ion, IMR, LiFePO4, Ni-MH, and Ni-Cd. It features an LCD display for real-time charging information, intelligent charging mode selection, and multiple safety protections. This manual provides detailed instructions for safe and efficient use of your UMS2 charger.
Image 1.1: Nitecore UMS2 Intelligent USB Dual-Slot Quick Battery Charger with its accompanying battery organizer.
2. Product Features
- Intelligent USB dual-slot charger capable of charging two batteries simultaneously and controlling each slot independently.
- QC 2.0 input available, enabling a total maximum output of 4000mA.
- Single slot maximum output of 3000mA for rapid charging.
- Compatible with Li-ion, IMR, LiFePO4, Ni-MH, and Ni-Cd batteries with automatic detection.
- Automatic detection of battery power level and selection of appropriate voltage and charging mode (LiFePO4 and 3.8V Li-ion batteries excluded).
- Automatic selection between 3 charging modes: Constant Current (CC), Constant Voltage (CV), and -dV/dt.
- Energy-efficient LCD display for real-time charging information.
- Capable of manually selecting the charging cut-off voltage and charging current.
- Automatic detection of large/small capacity batteries and automatic selection of appropriate charging current.
- Automatic termination upon charging completion.
- Reverse polarity protection and short circuit protection.
- Over-discharged battery activation and Li-ion battery restoration.
- Overtime charging protection.
- Automatic detection of battery internal resistance and display of battery health.
- Made from durable and fire-retardant PC materials.
- Optimal heat dissipation design.
- Multiple input sources available: USB Adapter, Power Bank, Solar Panel.
Image 2.1: Detailed list of Nitecore UMS2 charger features and specifications.
3. Setup
- Power Connection: Connect the UMS2 charger to a power source using a USB cable. The charger supports DC 5V/2A or 9V/2A (QC 2.0+) input. The LCD display will illuminate upon successful connection.
- Battery Insertion: Insert compatible rechargeable batteries into the charging slots. Ensure correct polarity (+/-) as indicated on the charger. The UMS2 will automatically detect the battery type and begin charging.
Image 3.1: The Nitecore UMS2 charger supports multiple input sources including USB adapters, power banks, and solar panels.
4. Operating Instructions
4.1. LCD Display Information
The UMS2 features an intelligent LCD display that provides real-time charging status and battery information. The display shows:
- CHG. STATUS: Current charging status (e.g., charging, full).
- Quick Charge: Indicates if Quick Charge mode is active.
- CHG. MODE: Current charging mode (CC, CV, -dV/dt).
- Battery Type: Detected battery chemistry (Li-ion, LiFePO4, NiMH/NiCd).
- Cut-off Voltage: The target voltage for the battery type.
- Charged Volume (mAh): Amount of charge delivered.
- Charging Time: Duration of the current charging cycle.
- Charged Current (mA): Current charging rate.
- Battery Voltage (V): Real-time battery voltage.
- Internal Resistance (mΩ): Displays the battery's internal resistance.
- Battery Health: Indicates the overall health status of the battery (Good/Poor).
Image 4.1: The LCD display of the Nitecore UMS2 provides comprehensive real-time charging information.
4.2. Cycling Through Information
Short press the V button to cycle through the different charging information displayed on the LCD screen for the selected slot.
4.3. Manual Charging Settings
The UMS2 allows for manual adjustment of charging voltage and current for specific battery types.
- Charging Voltage Selection: The charger supports 4.3V, 4.2V, and 3.7V cut-off voltages.
- Charging Current Selection: Adjustable from 100mA to 3000mA.
Image 4.2: The Nitecore UMS2 allows for manual selection of charging voltage and current.
4.4. IMR Battery Charging Program
The UMS2 features a specialized charging program for IMR batteries. This program monitors the entire charging process to ensure the cut-off voltage remains within safe limits, thereby extending the lifespan of the batteries.
5. Battery Compatibility
The Nitecore UMS2 is compatible with a wide range of cylindrical rechargeable batteries:
- Li-ion / IMR / LiFePO4: 10440, 14500, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700
- Ni-MH / Ni-Cd: AA, AAA, AAAA, C, D
6. Specifications
| Input | DC 5V/2A, 9V/2A (18W) |
| Output Voltage | 4.35V±1%, 4.2V±1%, 3.7V±1%, 1.48V±1% |
| QC Mode Output | 3000mA*1 (MAX), 2000mA*2 (MAX) |
| Standard Mode Output | 2000mA*1 (MAX), 1000mA*2 (MAX) |
| Dimensions | 152mm × 73mm × 40mm (5.98" × 2.87" × 1.57") |
| Weight | 157.7g (5.56oz) (Charging cable not included) |
7. Maintenance
- Keep the charger clean and free from dust and debris.
- Store the charger in a dry environment away from direct sunlight and extreme temperatures.
- Avoid dropping or subjecting the charger to strong impacts.
- Do not attempt to disassemble or modify the charger, as this will void the warranty and may cause damage or injury.
8. Troubleshooting
8.1. "EE EE" Error Message
If the LCD screen displays "EE EE", it indicates one of the following conditions:
- Over-discharged IMR Battery: The battery is severely discharged. The charger will attempt to activate it. If activation fails, the battery may be unrecoverable.
- Damaged Battery: The battery is detected as damaged or faulty. Do not attempt to charge damaged batteries. Remove the battery immediately.
Image 8.1: The 'EE EE' error message indicates an over-discharged IMR battery.
Image 8.2: The 'EE EE' error message also indicates a damaged battery.
8.2. Charger Not Powering On
- Ensure the USB cable is securely connected to both the charger and the power source.
- Verify that the power source (USB adapter, power bank, etc.) is functioning correctly and providing sufficient power (DC 5V/2A or 9V/2A).
- Try a different USB cable or power source.
8.3. Battery Not Charging
- Check that the battery is inserted with correct polarity.
- Ensure the battery type is compatible with the UMS2 charger.
- Clean the battery contacts and charger contacts with a dry cloth to remove any dirt or corrosion.
- If the battery is severely over-discharged, it may take some time for the charger to activate it, or it may be unrecoverable.
9. Warranty and Support
For warranty information and technical support, please refer to the official Nitecore website or contact your authorized Nitecore dealer. Keep your purchase receipt as proof of purchase for warranty claims.
