The Efest iMate R4 four bay battery Charger is a simple and cost-efficient charger designed by Efest. Smart Battery charging with 4 spring-loaded, self adjusting battery bays for charging the following battery sizes: 10440 / 14500 / 16340 / 17340 / 18350 / 18500 / 18650 / 20700 /26500/ 26650  Li-Mn or Li-ion battery.