Efest Slim K4 USB-C Battery Charger


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Discover the Efest Slim K4 USB-C Battery Charger: Your essential companion for keeping your batteries charged and ready. Offering flexibility, safety, and reliability, it’s the smart choice for vapers who demand the best in battery charging solutions.

Please Note: No batteries are include with this charger. Batteries can be purchased separately here:

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The Efest Slim K4 stands at the forefront of battery charging technology, offering a versatile and speedy charging solution for a wide array of Lithium IMR batteries. Its compact design, coupled with the advanced USB-C connectivity, ensures your batteries are charged efficiently and safely, making it an indispensable accessory for vaping enthusiasts.

Key Compatibility:

The Efest Slim K4 is engineered to be universally compatible with Lithium IMR 3.6V/3.7V batteries, accommodating sizes including but not limited to:

  • 10440
  • 14500
  • 16340
  • 17340
  • 18650
  • 18490
  • 18500
  • 26500
  • 26650
  • 20700
  • 21700

Advanced Features:

  • Adaptive Charging: Automatically adjusts charging current based on the number of batteries, supporting 1 x 1.0A, 2 x 1.0A, 3 x 0.5A, or 4 x 0.5A configurations.
  • Independent Monitoring: Each slot is independently monitored and charged, ensuring optimal charging efficiency.
  • Intelligent Protections: Equipped with six layers of protection including short circuit, overcharging, and reverse polarity safeguards for peace of mind.
  • Activation Recovery: Features a low voltage smart activation recovery function to rejuvenate over-discharged batteries.
  • Portable Design: Its super lightweight build makes it easy to carry, perfect for on-the-go vaping needs.

Design and Build:

  • High-Quality Springs: Utilizes piano wire springs for smooth battery installation and removal.
  • Precision Charging: Steel cathode with hard chromium plating guarantees precise charging voltage.
  • Type-C USB Port: Minimizes heat generation for safer charging sessions.

Safety First:

Efest prioritises your safety with the Slim K4, integrating:

  • Short circuit protection
  • Automatic overcharging and over-discharge protection
  • Reverse polarity protection
  • Zero voltage activation recovery function
  • Double-layered hardware and software protection


Proudly bearing global certifications including FCC, CE, and RoHS, the Efest Slim K4 USB-C Battery Charger is backed by comprehensive insurance and technical support.

Packaging Contents:

  • Efest Slim K4 Battery Charger
  • Warranty Card
  • User Manual


Product Highlights:

  • 4 Bay Battery Charger with multiple charging speeds for efficiency
  • Automatically ceases charging upon completion
  • Designed with reverse polarity protection for added safety


Have this arrive at your door today with Same Day London Vape Delivery if you order before 4pm. For customers outside of London, we also offer FREE UK Tracked Shipping on all orders over £19.99.


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