For Li-ion batteries, the EFEST SLIM K4 Charger is a flexible and effective four-slot charger. It ensures rapid and even charging of numerous batteries at once by providing a 1A charging current per slot. With clever LED indications for every slot, it offers easy-to-read information on the charging state. Improved safety measures that ensure dependable and secure operation include short circuit, overcharge, and overcurrent protection. The EFEST SLIM K4 is ideal for home and travel use, meeting all of your battery charging needs with its elegant, portable design.