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The UltraFire WF-139 battery charger has two independent charging bays. You can independently charge two batteries of unequal discharge at once. Charge only with 14500, 1700, 18500, 17670, or 18650 batteries. The Ultrafire charger has excellent charging features and capabilities such as its alternating current which charges the batteries quickly and efficiently.
This Ultrafire WF-139 Lithium Ion battery charger is one of the most affordable dual bay battery rechargers for e cigarette batteries such as the 18650. The WF-139 charger is integrated with smart auto shutoff detection as the batteries reach a full charge, this prevents overcharging and greatly extends the life of your external batteries.
Compatible with 14500, 17500, 17670, 18500, and most 18650 batteries