Note: Batteries not included. You may buy your lithium batteries here originais.

The Efest Slim K4 is a four-slot high-performance charger designed to provide speed and safety in charging your batteries. With a compact and intelligent design, this model automatically detects each battery's needs, ensuring efficient charging. It is the ideal choice for users seeking reliability and practicality in daily use.

Technical Specifications

• Brand: Efest
• Certification: CE and RoHS certified product.
• Number of slots: 4 independent charging channels.
• Input: AC 100~240V 50/60Hz or DC 5V 2A.
• Output: DC 5V 2A
• Compatibility: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 26500, 26650.
• Interface: LED indicator to monitor battery life.

Usage Instructions

1. Connect the power cord to an appropriate power source.
2. Insert the batteries into the slots, ensuring correct polarity.
3. The LED indicators will show the charging status in real time.
4. Remove the batteries as soon as charging is complete to maximize their lifespan.

In case of abnormal behavior, stop use and contact our support.

• ELECTRICAL SAFETY WARNING: Certificate with CE and RoHS protections against overload, short circuit and reverse polarity. Never leave batteries charging unattended or on flammable surfaces. For a safe experience, please consult our Beginner FAQ.