Efest SLIM K4 Intelligent USB Charger - 4 Bay

Efest SLIM K4 Intelligent USB Charger - 4 Bay

Regular price $32.95 Sale

Efest K4 - 4 Bay

Intelligent Slim K4 Battery Charger by Efest

Cost effective and spacing saving with all the safety features. The Efest Slim K4 battery charger is an excellent battery charger via a Type-C USB charging port. It's great compact charger for home or travel.

The Efest Slim K4 is a professional portable two-slot Li-ion battery charger. It has a fast charging mode. It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700.


  • Four-bay charger can charge up to four batteries simultaneously
  • Compatible with many battery sizes, including 18650, 20700, 21700 & 26650
  • Charging speed: 4 x 0.5A, 3 x 0.5A, 2 x 1A, 1 x 1A
  • Automatically stops charging
  • Reverse polarity protection
  • Input: Type-C USB DC 5V 2A
  • Output: DC 4.20V±0.05V 0.5A*4/0.5A*3/1A*2/1A*1

Do NOT leave batteries charging unattended/overnight!