Efest Slim K4 Charger


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Does not include 18650 batteries. If you need batteries for your charger please click Here!

Select Vape presents the Efest Slim K4 Charger by (Efest). The Slim K4 Charger is an intelligent 4-bay charger powered with a USB Type-C and accepts a wide variety of battery sizes with rapid charging. Constructed from flame retardant ABS, the Skim K4 provides a wide variety of protections to ensure safe charging at all times. The USB Type-C port at the back powers the charger, providing up to 2000mAh when 2 bays are used at 1000mAh for each bay. When all four bays are used, charging is reduced to 500mAh per slot.

Compatible Batteries:

Li-ion 3.6/3.7V Batteries

  • 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700

See What Customers Are Saying:

  • “The Efest Slim K4 Charger works very well. Really like the fact that it connects via USB type C. Such a nice upgrade and no complaints so far!”
  • “Great product! Lightweight and easy to carry around and use on the go. Plus the USB Charging port helps as this is common around in households and other places.”

Features and Specs:


High Quality ABS Fire-Retardant Material

Electronic Component

LED Indicator

Safe Mode Charging

Auto-Detect Charging Current

Convenient USB Charger

Low Voltage Smart Activation Recovery Function

Lightweight and Portable

USB Port Design – Type-C

Short Circuit Protection

Automatic Over-Charging Protection

Automatic Over-Discharging Protection

Reverse Polarity Protection

Hardware and Software Double Protection


Input Power: DC 5V 2A

2*1A CC Current: 2000mA±10%

1*1A CC Current: 1000mA±10%

4*0.5/3*0.5A CC Current: 500mA±10%

Auto Cut-Off Voltage: 4.20±0.05V

CV Cut-Off Current: <100 A

Standby Current: <20mA

Activation Current: 50mA~100mA

Auto Recharge Voltage: 4.10±0.10V

Operation Temperature: 0°C ~ 40ºC

Storage Temperature: -40ºC ~ +70ºC

You Receive:

  • Efest Slim K4 Charger
    • USB Cable
    • User Manual
    • Warranty Card


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