SLIM K4 Charger is a intelligent charger that with a Type-C USB charging port. It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700. LED indicator will show you the status of charger: indicator turns blue in standby mode/full charged, white color in charging. SLIM K4 Charger is designed with some smart functions, such as auto-detect charging, monitors and charges each slot independently, low voltage smart activation recovery function, 0V activation recovery function. Besides, it is safe for you to use with built-in intelligent protection chip.

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 in Efest SLIM K4 Battery Charger Specification:

Brand	Efest
Product Name	SLIM K4 Charger
Compatible with	Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700
Input Power	DC 5V 2A
2*1A CC Current	2000mA±10%
1*1A CC Current	1000mA±10%
4*0.5A/3*0.5A CC Current	500mA±10%
Auto Cut-off Voltage	4.20±0.05V
CV Cut-off Current	＜100mA
Standby Current	＜20mA
Activation Current	50mA~100mA
Auto Recharge Voltage	4.10±0.10V
Operation Temperature	0℃~40℃
Storage Temperature	﹣40℃~+70℃
Auto-detect Charging Current	2×1.0A/1×1.0A/4×0.5A/3×0.5A