1. Introduction
This instruction manual provides essential information for the safe and efficient operation of your HIKOKI UC18YKSL Universal Battery Charger. This charger is designed to recharge HIKOKI 14.4V and 18V Li-Ion slide-style batteries. Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
Always observe the following safety precautions to prevent electric shock, fire, and serious injury.
- Read all instructions: Before using the charger, read all instructions and cautionary markings on the charger, battery pack, and product using the battery pack.
- Use only specified batteries: This charger is designed exclusively for HIKOKI 14.4V and 18V Li-Ion slide-style batteries. Do not attempt to charge any other types of batteries, as this may cause personal injury and damage.
- Avoid wet conditions: Do not expose the charger to rain or wet conditions. Water entering the charger will increase the risk of electric shock.
- Proper ventilation: Ensure adequate ventilation around the charger during operation. Do not block ventilation openings.
- Unplug when not in use: Always unplug the charger from the power outlet when not in use or before cleaning.
- Inspect for damage: Do not operate the charger if it has received a sharp blow, been dropped, or otherwise damaged. Take it to an authorized service center.
- Prevent overheating: The charger is equipped with safeguards to prevent overheating, overcharging, and short circuits. However, always monitor the charging process and ensure the charger is placed on a stable, non-flammable surface.
- Power source: This charger is designed for 100V AC power sources. Ensure your power supply matches this requirement.
3. Product Overview
The HIKOKI UC18YKSL is a compact and efficient universal battery charger for your HIKOKI Li-Ion power tool batteries.

Figure 1: HIKOKI UC18YKSL Universal Battery Charger. This image shows the black charger unit with the HIKOKI logo, "Li-ion 14.4V-18V" text, and the battery slide-in slot with electrical contacts and indicator lights.
Key Features:
- Charges HIKOKI 14.4V and 18V Li-ion slide-style batteries.
- Efficiently restores battery power, minimizing downtime.
- Built for durability in demanding work environments.
- Equipped with safeguards to prevent overheating, overcharging, and short circuits.
- Compact and lightweight design for easy portability.
4. Setup
- Unpack the charger: Carefully remove the charger from its packaging.
- Choose a location: Place the charger on a stable, flat, and non-flammable surface in a well-ventilated area. Ensure it is away from direct sunlight, heat sources, and moisture.
- Connect to power: Plug the charger's power cord into a standard 100V AC electrical outlet.
5. Operating Instructions
Charging a Battery:
- Insert battery: Slide a compatible HIKOKI 14.4V or 18V Li-Ion battery pack into the charger's slot. Ensure it clicks securely into place.
- Monitor indicator light: The charger will begin charging automatically. Refer to the indicator light status below.
- Remove charged battery: Once charging is complete, remove the battery from the charger.
Indicator Light Status:
- Solid Red Light: Battery is charging.
- Slowly Blinking Red Light: Charging is complete.
- Rapidly Blinking Red Light: Indicates an error (e.g., battery too hot/cold, faulty battery). Remove the battery and allow it to cool or warm to room temperature before attempting to charge again. If the error persists, the battery or charger may be defective.
Charging times typically range from 35 to 150 minutes, depending on the battery's capacity and charge level.
6. Maintenance
- Cleaning: Disconnect the charger from the power supply before cleaning. Use a dry cloth to wipe the exterior of the charger. Do not use water or chemical cleaners.
- Storage: Store the charger in a dry, cool place, away from direct sunlight and moisture, when not in use.
- Inspection: Periodically inspect the charger and its cord for any signs of damage. If damage is found, discontinue use and contact an authorized service center.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger indicator light does not illuminate. | No power to the charger. | Ensure the charger is securely plugged into a live 100V AC outlet. Check the circuit breaker. |
| Rapidly blinking red light. | Battery too hot or too cold, or faulty battery/charger. | Remove the battery and allow it to reach room temperature (20-25°C or 68-77°F). Reinsert the battery. If the issue persists, the battery or charger may require service. |
| Battery does not charge or charges slowly. | Battery is fully charged, battery is faulty, or charger is faulty. | Check the indicator light (slowly blinking red means fully charged). Try charging a different, known-good battery. If other batteries also fail to charge, the charger may be faulty. |
8. Specifications
- Model: UC18YKSL
- Input Voltage: 100V AC
- Output Voltage: 17V DC
- Compatible Battery Types: HIKOKI 14.4V and 18V Li-Ion slide-style batteries (BSL14 series, BSL18 series)
- Typical Charging Time: 35-150 minutes (varies by battery capacity)
- Item Weight: 12.3 ounces (0.35 kg)
- Product Dimensions: 3.44 x 6.88 x 2.56 inches
- Certifications: RoHS, UL, CE, FCC, CSA
9. Warranty and Support
The HIKOKI UC18YKSL Universal Battery Charger is warranted to the original purchaser to be free from defects in materials and workmanship for a period of 1-year from the original purchase date.
For warranty claims, technical support, or service inquiries, please contact HIKOKI customer service or an authorized service center. Keep your proof of purchase for warranty validation.





