This MultiCharger has six bays, so it can charge up to six batteries at the same time, which is a great advantage for when you suddenly find that several of your rechargeable batteries are low on power and you need to quickly and to efficiently revitalize them. The springs and tabs that hold the batteries in place in their slots are built from stainless steel, and are guaranteed to not crack, split, or fracture even after heavy and frequent use. Every slot is equipped with its own screen that oversees the charge of each individual battery. The Efest smart charger even displays the individual voltage and charging current of each battery. To use the device, simply insert a rechargeable cell into a bay. The charger is so smart, it is capable of detecting the chemistry and voltage and selecting the appropriate charging method.