Efest Slim K4 Charger

Efest Slim K4 Charger – The Efest Slim K4 Charger by Efest is a high quality, cost effective and modern design battery charger. The Slim K4 charger is a Quadruple Bay charger built for charging 4 Batteries simultaneously at 1A.


Availability: Only 2 left in stock

Efest Slim K4 Charger

The Efest Slim K4 Charger is an upgraded version from K1 by Efest. The Slim Efest K4 Charger is a high quality, cost-efficient and portable battery charger. It is a Dual Bay charger with Micro USB input and charges at 1A. Each slot is monitored independently to provide the most efficient charge. The LED indicates when your battery is charging and when the battery is fully charged. The Efest Slim K4 Charger features reverse polarity, short circuit protection, overcharge protection and many more safety features. The Efest Slim K4 Charger can charge different types of 3.6V/3.7V lithium batteries commonly used in electronic cigarettes, flashlights, doorbells, electric tools, and more.

Efest slim K4 charger is compatible with: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 26500, 26650 Portable Design with Quality Piano Springs, Battery Life LED Indicator Light. Double Slot 5V/1A Micro USB Charger



  • Charger Type: Quadruple Bay (4 Bays)
  • AC Input Power: AC 100~240V 50/60Hz
  • DC Output Power: DC 5V 1A
  • DC Input Power: DC 5V 1A 1A CC
  • Current: 1000mA (+/-10%)
  • Auto Cut-Off Voltage: Yes
  • Short Circuit Protection: Yes
  • Charging: Micro USB to USB Cable

What’s in the Box:?

  • 1 x Quadruple Bay Slim K4 Charger
  • 1 x USB Lead

*Batteries are not included, pictures are for illustration purposes only!

Pack Size

1 Charger

Battery Bays

2 – Double Bay

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