The Slim K4 Charger by Efest is lightweight and portable charger that features LED battery indicator lights, USB Type-C port, and uses piano wire for springs that have been 15000 times tested for quality.
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: 4.20V±0.05V
CV cut-off current: <100mA
Standby Current: <20mA
Activation Current: 50mA~100mA
Auto recharge voltage: 4.10±0.10V
Operation Temperature: 0°C~40°C
Storage Temperature: -40°C±70°C
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.
HIGH QUALITY CRAFTSMANSHIP - Spring made by piano wire, it provides a smooth sliding action when installing and removing batteries. Steel cathode with low resistance and hard chromium plating processing to achieve a more precise charging voltage. 15,000 + times spring testing quality warranty.
USB PORT DESIGN - The Type-C USB port reduces the heat of the port effectively.