Cost effective and spacing saving with all the safety features. The Efest Slim K4 battery charger is an excellent battery charger via a Type-C USB charging port. It's great compact charger for home or travel.
The Efest Slim K4 is a professional portable two-slot Li-ion battery charger. It has a fast charging mode. It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700.