WARNING: This product contains nicotine. Nicotine is an addictive chemical.

Efest Slim USB K1 Charger


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Efest Slim USB K1 Charger

The eFest Slim K1 Charger features a piano wire spring which provides a smooth sliding action when installing and removing batteries. The spring has been tested over 15,000 times for quality reassurance. The steel cathode with low resistance and hard chromium plating processing achieves a more precise charging voltage.


  • Fast Charging Mode: 1.0A
  • Fit to 3.6V or 3.7V Lithium Battery in different sizes
  • Reverse Polarity Protection
  • Activation Function
  • Auto-detect Charging Function
  • Over-Charging Protection
  • Short Circuit Protection


Slim K1 Charger Body

USB Cable

Warranty Card

Operation Manual

Additional information




Excise Tax