Introducing the Efest K4 Slim, a high-performance USB-C charger catering to four battery cells with swift charging capabilities. Compatible with various battery sizes, this sleek charger ensures a quick recharge moments after cell installation. The standby mode and fully charged status are indicated by a vibrant blue light, while the white light signals that the battery cells are properly set.

With an auto-detect charging current ranging from 1.0A to 0.5A for different configurations, the K4 Slim ensures safe charging throughout.Each slot is independently monitored and charged, and the charger incorporates a low-voltage smart activation recovery function. Remarkably lightweight and portable, the Efest K4 Slim is your ideal companion for efficient and safe battery charging.