The Efest Slim K2 is a professional portable two-slow Li-ion battery charger with a Micro USB charging port. It has a fast charging mode that is 1.0A (4.2V 2pcs x 1.0A) and can accept 3.6V or 3.7V lithium batteries in various sizes (sold separately). The Efest Slim K2 features reverse polarity protection, activation function, auto-detect charging function, over-charging protection, and short circuit protections. The spring in the charger is made by piano wire that provides a smooth sliding action when installing and removing batteries and steel cathode with low resistance and hard chromium plating processing is used to achieve a more precise charging voltage. Each slot on the Efest Slim K2 Charger monitors batteries separately and has a convenient LED indicator that displays battery life.
 
Product Specification: 
- AC Input Power AC 100-240V 50/60Hz
 - DC Output Power DC 5V 2A
 - Auto Cut-Off Voltage 4.20±0.05V
 - Standby Current <20mAh
 - Auto Recharge Voltage 4.10±0.10V
 - Storage Temperature -40℃~+70℃
 - DC Input Power DC 5V 2A
 - 1A CC Current <100mAh
 - CV Cut-Off Current < 100mAh
 - Activation Current 50mA~100 mA
 - Operation Temperature 0℃~40℃