EFEST Slim K4 18650, 21700 Battery Charger 4-Bay

(Batteries Sold Separately) Specifications: 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 ------------ 4.20V±0.05V CV cut-off current ------------ <100mA Standby Current ------------ <20mA Activation Current ------------ 50mA~100mA Auto recharge voltage ------------ 4.10±0.10V Compatible with 3.6V / 3.7V LIMN / LI-ION Batteries: 10440 14430 14500 16340 16500 17335 17650 17670 18500 18650 20700 22650 26500 26650 ect. LED INDICATOR DESCRIPTION - After inserting the battery into the slot correctly, the Slim K4 will start charging the battery automatically within a few seconds. The LED indicator lights will show white while the battery is charging and change to blue once fully charged.  USB PORT DESIGN - The Type-C USB port reduces the heat of the port effectively.