Efest Slim K4 USB-C Battery Charger can be used to charge compatible replaceable, rechargeable batteries via a Type-C USB charging port. You can charge up to four batteries in this charger and keep safe with its built-in, intelligent protection chip that includes smart functions such as:

• auto-detect charging
• monitors and charges each slot independently
• low voltage smart activation recovery
  
• 0V activation recovery.

It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700.

The Efest Slim K4 charger will even tell you what it's doing with its LED indicator colour light that will turn blue in standby mode/full charged and white when charging.

Please note: a 2A USB port is recommended.

Efest Slim K4 USB-C Battery Charger Specifications:

• 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

Package includes:

• Efest Slim K4 USB-C Battery Charger
  
• Type-C USB cable
  
• Warranty card
  
• User manual