USB-C Dual-Slot Portable Li-ion Battery Charger
Broad Compatibility · Smart CC/CV Charging · 1000mA per Bay · Multiple Safety Protections
Key Features at a Glance
| Feature |
Description |
| USB-C Input |
Compatible with any 5V power bank, solar panel, or USB adapter — charge anywhere, anytime |
| Automatic CC/CV Charging Mode |
Intelligently selects the most suitable charging mode (constant current / constant voltage) |
| Independent Dual-Bay Control |
Each of the 2 bays charges independently without affecting the other |
| Trickle Charging |
Automatically switches to trickle mode when battery voltage is below 2.9V, protecting the battery and extending its lifespan |
| Over-Discharge Battery Activation |
Automatically detects and reactivates batteries that have over-discharged due to storage or improper use (for protected Li-ion cells) |
| Multiple Safety Protections |
Reverse-polarity/short-circuit protection, intelligent temperature control, and overcharge protection — four layers of safety |
| Lightweight & Portable |
Just 79.5g, 125.5 × 59.5 × 32.1mm — easy to carry anywhere outdoors |
| Fire-Retardant Housing |
Built with PC fire-retardant material to handle demanding outdoor charging environments |
Broad Compatibility for 3.6V/3.7V Li-ion Batteries
Charges 20700 and 21700 cells, along with the following battery models:
10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650
Automatic CC/CV Charging Mode
The UI2 intelligently selects the most suitable charging mode for each battery, switching flexibly between constant current and constant voltage to balance charging efficiency with battery safety.
Up to 1000mA per Bay
Supports trickle charging to effectively protect batteries and extend their lifespan.
- When a battery with voltage below 2.9V is inserted, the charger automatically enters trickle charging mode at 100mA
- When a battery with voltage above 2.9V is inserted, the charger switches to standard charging mode with a maximum current of 1000mA
Clear Charge-Level Display
Built-in indicator lights let you check battery charge level and charging status at a glance, in real time.
Over-Discharge Battery Activation
If a battery has over-discharged due to storage or improper use, the UI2 automatically detects and reactivates it, bringing "dormant" batteries back to life. (This feature applies to protected Li-ion cells.)
Multiple Protections for Safe Charging
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Reverse-Polarity & Short-Circuit Protection: If a battery fault or short circuit occurs, all three indicator lights flash to alert the user
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Fully Automatic Intelligent Temperature Control: When ambient temperature rises too high, the UI2 automatically adjusts current to protect both the charger and the battery
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Overcharge Protection: When a battery is fully charged, all three indicator lights turn solid and charging automatically stops
Built with PC Fire-Retardant Material
Premium materials ensure safety, letting you charge confidently in complex and variable outdoor environments.
Certified for Peace of Mind
CE and FCC certified for guaranteed quality.
Lightweight & Portable, Charge Anywhere
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Dimensions: 125.5mm × 59.5mm × 32.1mm
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Weight: 79.5g
Compact and lightweight — slips easily into a backpack or pocket for hassle-free outdoor carry.
Specifications
| Item |
Spec |
| Model |
UI2 |
| Input |
DC 5V/2A 10W |
| Output Voltage |
4.2V±1% |
| Output Current |
1000mA×2 (max) |
| Compatible Batteries |
Li-ion/IMR: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 |
| Dimensions |
125.5mm × 59.5mm × 32.1mm |
| Weight |
79.5g |
FAQ
Q1: Which battery types are compatible with the NITECORE UI2?
A: The NITECORE UI2 offers broad compatibility for all 3.6V/3.7V Li-ion and IMR batteries. Supported sizes include: 10440, 14500, 16340 (RCR123), 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650, and more.
Q2: Does it use a USB-C port, and how can I power it?
A: Yes, the UI2 features a standard USB-C input. It can be powered by any 5V/2A (10W) USB wall adapter, power bank, solar panel, or car USB port. This makes it incredibly portable and perfect for outdoor or travel charging.
Q3: What is the charging speed? Can both slots charge at max speed simultaneously?
A: The UI2 provides a maximum output of 1000mA (1A) per slot. The two bays are fully independent, meaning both bays can charge simultaneously at up to 1A without affecting each other. If a battery voltage is below 2.9V, it will automatically enter a 100mA trickle charge mode to protect the cell.
Q4: Can the UI2 revive over-discharged batteries?
A: Yes, in most cases. The UI2 features an over-discharge battery activation function. When it detects a battery that has been over-discharged due to long-term storage or improper use, it automatically attempts to reactivate the cell. (Note: This applies to protected Li-ion cells).
Q5: How do I know when the battery is fully charged?
A: The UI2 features a clear LED indicator. When the battery is charging, the light will flash. Once the battery reaches the full 4.2V charge, the indicator light will stay solid (stop flashing), and the charger will automatically stop charging to prevent overcharging.
Important Safety Notice:
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Always use a 5V/2A or higher USB power adapter for optimal performance.
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Do not attempt to charge non-rechargeable batteries (e.g., alkaline) or damaged batteries that cannot be activated below 2.9V.
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During charging, place the charger in a well-ventilated area, away from high temperatures and flammable materials.
