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Efest Slim K1 Battery Charger


Product Description

You have the power, you are in charge (yes, pun intended). This sleek, yet portable Efest Slim K1 Charger is a 1-bay charger with a convenient micro-USB input, charging at 1A CC current. This Efest Slim K1 Charger might look small and simple, but it’s packed a multitude of features including: reverse polarity, over-charging detection, and short circuit protection. Fun fact: this charger is made with a piano wire spring for smooth sliding action and is tested over 15,000 times for quality control. There’s also a steel cathode with low resistance and hard chromium plating processing for the ultimate charging precision. The Efest Slim K1 Charger also features an LED indicator so you can easily see when your batteries are ready, and supports any 3.6V/3.7V lithium battery. Keep your mod going all day long with help from the super portable Efest Slim K1 Charger!


  • Fast charging mode 1.0A
  • Portable design with high-quality piano strings
  • Battery Life LED Indicator light
  • Reverse polarity protection
  • Activation function
  • Auto detect charging function
  • Over charging protection
  • Short circuit protection


  • Fit to 3.6v or 3.7v lithium battery in different sizes
  • Operation Temperature: 0C ~ 40C
  • Storage Temperature: -40C ~ 70C
  • Single Slot 5V/1A Micro USB Charger
  • AC Input Power: AC 100~240V 50/60Hz
  • DC Output Power: DC 5V 1A
  • DC Input Power: DC 5V 1A

What’s In The Box:

  • Slim K1 charger body
  • USB cable
  • Warranty card
  • Operation manual

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  1. Just what I needed.

    Posted by Unknown on Aug 16th 2017

    It's sleek, functional, does what it's supposed to. It's just what I needed. The only thing that bugs me a little is that when I put my battery in it makes a very faint very high pitched ringing noise. I put it down and walk away and can't hear it but I can hear it right away as soon as I put the battery on. Weird. But other than that it's great.

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