1. Introduction
The KLARUS K2A is a versatile 2-bay smart battery charger and power supply designed for various rechargeable lithium-ion batteries. It features an LED display for real-time information and supports fast charging protocols. This manual provides essential information for safe and efficient use of your K2A charger.
2. Package Contents
- KLARUS K2A Battery Charger x1
- USB-A to USB-C Power Cord x1
- USB-C to USB-C Power Cord x1
- Cloth Bag x1
- Instruction Manual x1
Image: Contents of the KLARUS K2A package, showing the charger, two USB cables, a cloth bag, and the instruction manual.
3. Setup
3.1 Battery Compatibility
The K2A charger is compatible with 3.6V/3.7V Li-ion/IMR/INR/ICR 18650, 20700, and 21700 lithium batteries. Single battery length should be between 70-78mm. Do not attempt to charge Zinc-Carbon, Ni-MH/Ni-Cd, CR123A, CR2, or other non-rechargeable batteries.
3.2 Inserting Batteries
Open the magnetic cover of the charger. Insert compatible batteries into the two bays, ensuring correct polarity (+ and -). The magnetic cover helps keep batteries secure and protects against dust.
Image: The KLARUS K2A charger with two batteries inserted, illustrating its compatibility with 18650, 21700, and 20700 battery types.
Image: The KLARUS K2A charger with its magnetic cover removed, revealing the two battery compartments.
4. Operating Instructions
4.1 Charging Batteries
Connect the K2A charger to a power source using the provided USB-A to USB-C or USB-C to USB-C cable. The charger supports fast charging with a maximum power of 18W. It can charge two different types of compatible rechargeable batteries simultaneously. The LED display will show the charging status.
Image: The KLARUS K2A charger actively charging two batteries, highlighting its high-speed charging feature.
4.2 Using as a Power Bank
When charged lithium batteries are inserted, the K2A can provide output power to external devices. It features both USB-A and USB-C output ports. Connect your device (e.g., mobile phone, flashlight, earphones, headlamps) to the appropriate output port using a compatible cable.
Image: The KLARUS K2A charger connected to and charging a mobile phone and a pair of earphones, demonstrating its 2-in-1 power bank functionality.
Image: A diagram illustrating the various input sources (power adapter, car charging, computer, socket) and output devices (phone, headset, watch, tablet) compatible with the KLARUS K2A charger.
4.3 LED Display
The smart LED display shows the capacity of each battery slot, charging voltage, and current in real-time. Press the side button to toggle displaying the status of individual batteries.
Image: A close-up view of the KLARUS K2A's smart LED display, showing detailed information such as battery charge percentage, voltage, and current.
4.4 Battery Revival Function
The K2A features an 'O volt' battery revival function, which can activate batteries that have become dormant due to over-discharge.
Image: The KLARUS K2A charger with its magnetic cover removed, revealing the two battery compartments.
5. Safety Warnings
The KLARUS K2A Charger complies with CE/FCC/UKCA/RoHS/PSE standards. It is constructed with fireproof materials and features excellent heat dissipation and electronic circuit design to ensure safe charging. Key safety features include:
- Over-charging protection: Prevents charging beyond the battery's capacity.
- Over-voltage protection: Prevents charging over the battery's voltage limit.
- Over-current protection: Prevents charging current from exceeding safe limits.
- Over-discharge protection: Prevents excessive discharge of batteries.
- Reverse-polarity protection: Protects the battery from damage if inserted incorrectly.
- Short-circuit protection: Automatically stops charging when a short-circuit occurs.
Image: A visual representation of the KLARUS K2A charger's six layers of protection, including over-charging, over-voltage, reverse-polarity, over-current, over-discharge, and short-circuit protection.
6. Specifications
| Model | K2A |
| Product Dimensions | 5.19"D x 2.28"W x 1.1"H (1.97 x 1.97 x 1.97 inches) |
| Item Weight | 5.3 ounces |
| Output Voltage | 5 Volts (DC) |
| Specification Met | CE/FCC/UKCA/RoHS/PSE |
| Manufacturer | KLARUS Electronics And Technology Co., Ltd. |
7. Maintenance
To ensure the longevity and optimal performance of your KLARUS K2A charger, keep it clean and dry. Avoid exposing it to extreme temperatures, direct sunlight, or corrosive materials. Regularly check the charging ports and battery bays for any debris. The magnetic cover helps protect the internal components from dust.
8. Troubleshooting
If the charger is not functioning as expected:
- Ensure batteries are inserted with correct polarity.
- Verify that the charger is properly connected to a power source.
- Check if the cables used are undamaged and compatible.
- Confirm that the batteries being charged are compatible and rechargeable.
If issues persist, please refer to the warranty and support section for further assistance.
9. Warranty and Support
For warranty information or technical support, please contact KLARUS customer service through their official website or the retailer from whom the product was purchased. Keep your purchase receipt as proof of purchase for warranty claims.
10. Product Video
Video: An official product video demonstrating the features and usage of the KLARUS K2A Smart Battery Charger, including battery insertion, LED display functions, and its capability as a power bank.
