fest | SLIM K4 USB-C Intelligent Battery Charger | 4 Battery
Cost-effective and easy to use, the Efest SLIM K4 Charger is incredibly lightweight and conveniently portable.
After inserting the battery into the slot correctly, the SLIM K4 will charge the battery automatically within a few seconds. The indicator while fully in standby / fully charged is a static blue, and turns white while charging.
- Auto-detect charging current: 2 x 1.0A / 1 x 1.0A / 4 x 0.5A / 3 x 0.5A
- Safe charging mode: CC & CV
- Safe and convenient USB Charging (5V 2A)
- Monitors and charges each slot independently
- Low voltage smart activation recovery function
- Incredibly lightweight and conveniently portable
- Spring made from piano wire provides 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 test quality warranty
USB Port Design
Type-C USB port reduces the heat of the port effectively
6 Protection Levels
- Short-circuit protection
- Automatic over-charging protection
- Automatic over-discharging protection
- Reverse polarity protection
- 0V activation recovery function
- Hardware and software double protection
- Input Power: DC 5V 2A
- 2 x 1A CC Current: 2000mA +- 10%
- 1 x 1A CC Current: 1000mA +- 10%
- 4 x 0.5A / 3 x 0.5A CC Current: 500mA +- 10%
- Auto Cut-Off Voltage: 4.2V +- 0.05V
- CV Cut-Off Current: <100mA
- Standby Current: <20mA
- Activation Current: 50mA ~ 100mA
- Auto Recharge Voltage: 4.1V +- 0.1V
- Operation Temperature: 0C ~ 40C
- Storage Temperature: -40C ~ +70C
- Battery Types Supported: 10440 / 14500 / 16340 / 17340 / 18350 / 18490 / 18500 / 18650 / 26500 / 26650 / 20700 / 21700