Efest Slim K1 – 1 Bay USB Lithium Battery Charger

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Product Introduction

The Efest Slim K1 is a compact, single-slot USB lithium battery charger, designed for safe, efficient, and portable charging. With its intelligent charging capabilities, the Slim K1 automatically detects battery type and applies the appropriate charging current to optimize battery life and performance.

Its slim and lightweight design makes it perfect for travel, everyday use, and emergency charging needs, ensuring convenience and reliability for flashlight users, vapers, and professionals.

Key Features

✅ Wide Lithium-Ion Compatibility: Supports various 3.6V/3.7V Li-Ion/IMR/INR/ICR batteries, including 18650, 20700, 21700, and more.
✅ Portable & USB-Powered: Ideal for on-the-go charging, powered via USB cable.
✅ Smart Charging System: Automatically detects battery type and applies optimal charging current.
✅ Fast & Safe Charging: 1A charging speed for efficient battery replenishment.
✅ Multiple Safety Protections: Features overcharge, short circuit, reverse polarity, and auto-cutoff protections.
✅ LED Indicator: Displays charging status in real time.

Specifications

Specification	Details
Brand	Efest
Model	Slim K1
Battery Type Supported	3.6V/3.7V Lithium-Ion (Li-Ion, IMR, INR, ICR)
Compatible Battery Sizes	10440, 14500, 16340, 17340, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22650, 26500, 26650
Input Power	DC 5V / 1A (USB)
Charging Current	1A (Automatic Selection)
Indicators	LED Charging Status Display
Safety Features	Overcharge, Short Circuit, Reverse Polarity, Auto-Cutoff Protection
Dimensions	110mm × 30mm × 30mm
Weight	~50g (without battery)

Applications

The Efest Slim K1 1 Bay USB Charger is ideal for:
🔋 Flashlight Batteries – Ensures reliable charging for high-performance LED flashlights.
🔋 Vape & E-Cig Batteries – Designed for safe and efficient charging of vape mod batteries.
🔋 Consumer Electronics – Charges batteries for wireless devices, cameras, and portable tools.
🔋 Portable Charging Solutions – Charge anywhere with USB-powered convenience.
🔋 Emergency Backup Charging – Can be powered via USB adapters, power banks, or solar chargers.

Safety Guidelines & Warnings

⚠️ IMPORTANT SAFETY NOTICE ⚠️
The Efest Slim K1 Charger is designed for charging lithium-ion batteries only. Improper usage may result in fire, explosion, or injury. Always follow proper charging procedures.

General Safety Guidelines

✔ Use only with compatible lithium-ion batteries—never attempt to charge non-rechargeable batteries.
✔ Connect to a stable USB power source (5V/1A) for safe and efficient charging.
✔ Monitor batteries while charging and avoid leaving them unattended.
✔ Ensure the battery is properly inserted with the correct polarity.
✔ Charge in a well-ventilated area to prevent overheating.
✔ Disconnect the charger when not in use to conserve power and prevent potential hazards.

🚫 Prohibited Uses & Handling

⛔ DO NOT use with non-lithium batteries such as NiMH, NiCd, or alkaline cells.
⛔ DO NOT expose to water, extreme heat, or direct sunlight.
⛔ DO NOT attempt to modify, disassemble, or tamper with the charger.
⛔ DO NOT use a damaged USB cable or charger—replace any frayed or broken parts immediately.
⛔ DO NOT leave batteries charging overnight or unattended.

⚠ User Responsibility & Risk Acknowledgment

The user assumes full responsibility for proper handling, usage, and storage of lithium-ion batteries and chargers.
Improper use may result in serious injury or damage—always follow manufacturer recommendations.
Efest is not responsible for damages caused by misuse or mishandling of this charger.

By purchasing and using the Efest Slim K1 1 Bay USB Lithium Battery Charger, you acknowledge and agree to follow all safety guidelines. Failure to comply may result in hazardous consequences.

Charge safely and efficiently wherever you go! 🔋⚡