Note: Batteries not included. You can buy your original lithium batteries here.

The Efest Slim K1 is a compact single-slot charger designed for maximum portability and reliability. With an ergonomic design that uses high-precision springs, it guarantees stable and durable contact. It is the ideal solution for those looking for a practical, safe charger with intelligent 1A charging via Micro USB.

Technical Specifications

• Brand: Efest
• Certification: CE and RoHS certified product.
• Number of slots: 1 smart charging port.
• Charging current: 1A (1000mA).
• Input: Micro USB (DC 5V 1A).
• Compatibility: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 26500, 26650.
• Interface: Status LED indicator light for charging.

Usage Instructions

1. Connect the Micro USB cable to a compatible power source (5V 1A).
2. Insert the battery into the slot, ensuring that the polarity (positive/negative) matches the markings on the device.
3. The LED indicator will light up to signal the charging process.
4. Unplug the charger and remove the battery after the indicator signals full charge.

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

• ELECTRICAL SAFETY NOTICE: Certified with CE and RoHS protections against overcharge, short circuit, and polarity reversal. Never leave batteries charging unattended or on flammable surfaces. For a safe experience, consult our Beginners FAQ.