Efest K4 Slim Battery Charger

Charges Up To Four Batteries, 2A Fast Charging, Safety Protections, Supports Multiple Battery Types
Made In China


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The Efest Slim K4 Battery Charger is a handy vape battery charger that can charge up to four batteries at the same time. Compatible with Lithium IMR 3.6V/27.V batteries, it features fast 2A charging. This means that it’ll charge your batteries within a few hours. Plus, the four spring-loaded bays make installing them quick, easy and secure.


  • 2A Fast Charging
  • Charges Up To Four Batteries
  • Built-In Safety Protections
  • Supports Multiple Battery Types
  • Led Charging Indicators

Four LEDs display the charge level of each battery to help you keep track of when they’re ready to use. While we strongly advise that you never leave charging batteries unattended, the Slim K4 offers numerous safety features to protect both you and your batteries. These include protections against short-circuits, overcharging, over-discharging, reverse polarity protection and more. Your charger is powered by a USB-C cable, which can be plugged into the USB-C port near the bottom.

This charger is compatible with a wide range of battery types, including 18350, 18650, 26650, 20700 and 21700 batteries. That said, we always recommend that you check that specific batteries are compatible before charging or using them via the user manual.


  • Efest Slim K4 Battery Charger
  • USB-C Charging Cable
  • User Manual
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By Sandi from UK

Quick & Simple to Use (24 December 2023)

First things first, ordered this on the 23rd December and it's delivered on the 24th. Was concerned I may not be able to charge my batteries over the holiday season, but due to Vape Club's (and Royal Mail) first class service their free overnight shipping did not let me down at all!

It's a cracking little unit. The spring loaded slots are easily taking any size battery I have, unlike some of the Efest models which struggle with some of the larger ones. It runs on any USB port, or you can use a plug, and the display changes clolour to show you when charging is done. Job done.

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