Efest SLIM K1 Intelligent Charger


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The Efest SLIM K1 Intelligent Charger is a simple and high quality charger that will give your batteries a quick charge with all the safety features. The battery slide spring is made of high quality piano wire, to ensure a smooth sliding when installing or removing batteries. It also features a steel cathode with low resistance and a hard chromium plating process to achieve a more precise charging voltage. This smart battery charger will automatically stop charging your batteries when it sees that your battery is fully charged. The LED screen will show you when your battery is charging and when it is fully charged. The Efest SLIM K1 Charger is able to charge a various number of battery cell size, including the 20700 and 21700 Batteries. You cannot go wrong with this charger!

(Batteries not Included)


  • Single Battery Slot 5V/1A Micro USB Charger
  • Fast Charging Mode 1.0A
  • Compatible With Various Sized 3.6V/3.7 Li-Ion/Li-Mn Batteries
  • Input: AC 100-240V 50/60HZ
  • Output: 1A 
  • 4-Point Protection
    • Over-Voltage
    • Over-Charge
    • Short-Circuit
    • Reverse Polarity
  • Automatically Stops Charging When Batteries Are Fully Charged
  • Auto-Recharge When Voltage Lower Than 4.05V


1x Efest SLIM K1 Intelligent Battery Charger

1x USB Cable

1x Warranty Card

1x User Manual

2 Reviews Hide Reviews Show Reviews

  • 4
    Efest Battery Charger

    Posted by Mike on Sep 27, 2019

    Works great. Light turns off when fully charge. Would recommend

  • 5
    Great for the price

    Posted by Jenn B on Mar 07, 2018

    It is great. Nice and small for easy travel, charges quickly and doesn't take up much room. Very awesome for when you need to only charge a battery for back up while you use another one in the mean time.